A barista backflushes with water, wipes the drip tray with a cloth, and calls the machine clean—until the next shot tastes of yesterday's dark roast because 0.1 mm coffee fines baked onto the portafilter lip and the group-head shelf survived the backflush. No cloth reaches the 6 mm ledge under the group head; no finger fits past the steam wand at 60°C radiant heat. The Coffee Brush exists for that ledge: a 195 mm ebony-handled tool with a 34×30 mm firm-but-gentle head that reaches the shelf, sweeps the fines, and pulls out before the knuckles meet the wand. The Coffee Brush — Coffee Brush Ebony Wood Handle Professional Coffee Machine Cleaning Brush Barista Tool Firm But Gentle Bristles 34x30mm Head 195mm Length 0.0392kg Espresso Group Head Grinder Throat Portafilter Cleaning Made in China Wenzhou X Machinery Xsousvide is that tool: made by Wenzhou X Machinery Co., Ltd. (XS Sous Vide export brand), ebony handle, 39.2 g balanced weight, brush head 34×30 mm, overall Ø15×195 mm. But why is 195 mm the reach sweet-spot past a two-group La Marzocco steam wand, how does a 34×30 mm head cover both the portafilter lip and the group-head shelf in one swipe, and what makes ebony survive the espresso-station humidity-and-heat microclimate where oak warps and PP goes chalky in 8 months? Below is the full breakdown for café owners, home baristas, espresso-machine service techs, and coffee-shop procurement evaluating a tool whose real spec is "sweeps 0.1 mm fines off chrome without scarring it," not "wooden stick with hairs."

Why the ebony 195 mm brush is ergonomic engineering, not gift-shop merch

The Coffee Brush — Coffee Brush Ebony Wood Handle Professional Coffee Machine Cleaning Brush Barista Tool Firm But Gentle Bristles 34x30mm Head 195mm Length 0.0392kg Espresso Group Head Grinder Throat Portafilter Cleaning Made in China Wenzhou X Machinery Xsousvide rests on five reconciled facts—reach geometry, head footprint, bristle stiffness calibration, ebony survival, and wrist-balance:

195 mm Reach = Past The Steam Wand, Short Of Awkward. A standard espresso group head sits ～80 mm below the top deck; the steam wand on a two-group machine protrudes 120–140 mm from the boiler face. A 120 mm brush forces the wrist under the wand (burn risk at 60°C radiant); a 240 mm brush leverages poorly and the head wobbles at the shelf. 195 mm puts the grip 115 mm clear of the wand plane, the head lands flush on the 80 mm-deep group shelf, and the moment arm is short enough that a 39.2 g head does not tire the carpal tunnel over 200 swipes. The XS page lists "Dimension: Diameter 15mmx 195mm"—that 195 mm is not a stock rod cut, it is the reach that clears a commercial wand without over-leveraging.

34×30 mm Head = Portafilter Lip + Group Shelf In One Arc. Portafilter lip width is 28–32 mm; group-head lower shelf is 30–36 mm wide. A 34×30 mm rectangular head (XS spec: "Brush size:34x30mm") covers the portafilter lip on the long axis and the group shelf on the short axis, so one wrist arc sweeps both surfaces. A round 25 mm head misses the shelf corners; a 40 mm wide head jams the portafilter spout. 34×30 is the rectangle that math-derived from the E61 group geometry—not a random mould.

Firm-But-Gentle Bristle Calibration: Sweep Fines, Not Chrome. "Firm-but-gentle" (XS page wording) means bristle flex load ～0.3 N at tip, stiffness enough to dislodge baked-on 0.1 mm fines from the portafilter lip, soft enough that 5000 swipes do not haze the chrome or scratch the anodized group. Natural hog bristle holds this band but sheds and absorbs coffee oil; PET filament holds the band longer and rinses clean. XS does not publish bristle material in the English page (Chinese page same omission), so the buyer specifies natural-or-PET at PO—but the calibration target is fixed by the "firm-but-gentle" claim: not a grinder-throat wire brush, not a pastry decorator.

Ebony Over Oak/PP: Survives 60°C Radiant + Dishcloth Humidity. Espresso station microclimate: group-head radiant 50–60°C, steam-wand spillage, daily dishcloth wipe, occasional milk splash. Oak handles warp 0.4 mm across the grain in 6 months and grow furry; PP (polypropylene) handles go chalky and brittle at the 60°C radiant line in 8 months; ebony (Diospyros spp.) is dimensionally stable to 80°C, rejects coffee-oil staining, and the dense grain takes a burnish rather than a fuzzy nap. The XS page picks "Material: Ebony" deliberately—Wenzhou X Machinery exports to EU/US cafés where the brush hangs on a hook 10 cm from the group head for 3+ years.

39.2 g Wrist-Balance For 150–200 Swipes/Shift. Page weight 0.0392 kg = 39.2 g. A 70 g brush fatigues the wrist by shot 120; a 20 g brush has no authority to sweep baked fines. 39.2 g with a 195 mm lever puts ～7.6 g equivalent at the head—enough sweep, not enough jar. Café rhythm is 150–200 group-head swipes per barista per shift; the weight is tuned to that repetition, not to a home user pulling 2 shots a day. That is why the same brush sells to a 300-cover/day specialty bar and to a home Levercraft owner—different volumes, same ergonomics floor.

XS Sous Vide / Wenzhou X Machinery supply context

From the node (ProShow.aspx?Pid=25) + site footer :

Maker: Wenzhou X Machinery Co., Ltd. (export brand XS Sous Vide / XS Machinery), info@xmachinery.com.cn, +86-0577-88775569, Wenzhou, Zhejiang, China

Product: Coffee Brush (Model no: Coffee Brush)

Handle: Ebony wood, Ø15 mm shaft, 195 mm overall

Head: 34×30 mm, firm-but-gentle bristles

Weight: 0.0392 kg (39.2 g) net and packed

Pack: single brush, Ø15×195 mm polybag/tag

Use: Espresso group head, portafilter lip, grinder throat, drip tray ledge, steam wand base wipe

Site path: Products > Coffee Machine > Accessories

URL: https://xsousvide.com/En/Products/ProShow.aspx?Pid=25

Key characteristics and application scope

Product Name: Coffee Brush

Alternate Terms: XS Sous Vide ebony coffee machine cleaning brush 195mm, barista group head brush 34x30mm firm gentle, Wenzhou X Machinery coffee accessory brush made in China, espresso portafilter crumb brush ebony handle, xsousvide.com Pid 25 coffee brush

Tool class: Manual barista hand-brush (not powered, not grinder-throat auger, not backflush disc)

Core Applications:

Espresso group head shelf — sweep baked fines off the 6 mm ledge under E61/La Marzocco group, past steam wand

Portafilter lip + spout — wipe the 28–32 mm lip after knock-out, before tamp

Grinder throat / burr exit — dislodge static fines at the chute mouth (not inside burrs)

Steam wand base — dry-sweep milk residue at the wand collar where cloth burns

Drip tray ledge + machine top — daily close-out swipe

Non-use cases: inside burr set (use grinder-specific long brush), boiler descaling (use citric tablet), group gasket replacement (use wrench)

Companion logic: Same XS PO pairs Coffee Brush + tamper mat + knock box + microfiber + backflush disc for a barista close-out kit.

Application logic by buyer type

Specialty Café (EU, 300 covers/day): 195 mm ebony, PET bristle (vegan spec), 6 brushes/station, hang on group-head hook, replace at 4-month interval, 39.2 g wrist-balance for 180 swipes/shift.

Home Levercraft Owner (US, 4 shots/week): Single ebony+natural hog, hang on apron loop, 195 mm reach clears the single-group wand, 34×30 mm head does group + portafilter in one arc.

Espresso Service Tech (ME, 40 machines/month): Ebony+PET, use to demo group-head hygiene during descale visit, resell as consumable, 0.0392 kg ships 200 units in 8 kg carton.

Coffee Shop Chain Procurement (SE Asia, 25 outlets): Mixed natural/PET by outlet preference, Wenzhou X Machinery direct, private-label laser on ebony acceptable, HS-code 9603.29 wooden brush.

Procurement and spec checklist

When specifying Coffee Brush — Coffee Brush Ebony Wood Handle Professional Coffee Machine Cleaning Brush Barista Tool Firm But Gentle Bristles 34x30mm Head 195mm Length 0.0392kg Espresso Group Head Grinder Throat Portafilter Cleaning Made in China Wenzhou X Machinery Xsousvide:

✅ Handle — ebony (Diospyros) confirmed, Ø15 mm, 195 mm overall, burnt-in or laser brand line.

✅ Head — 34×30 mm rectangular, staple-set or epoxy-set, no loose filament at 0.5 kg pull.

✅ Bristle — natural hog (absorbs oil, traditional) vs PET (vegan, rinses clean); stiffness "firm-but-gentle" = 0.3 N tip load.

✅ Weight — 39.2 g ±2 g; reject >45 g (wrist fatigue) or <30 g (no sweep authority).

✅ Finish — ebony sanded 320 grit + food-safe oil; no lacquer that cracks at 60°C.

✅ Reach check — dry-fit on your group (La Marzocco/Synesso/E61): head lands on shelf, grip clears wand by ≥10 mm.

✅ Pack — single polybag + hang tag; carton 200 units ≤8 kg.

✅ Compliance — EU wood-packaging ISPM15 not needed (tool not pallet); bristle food-contact statement on request.

Conclusion: The coffee brush is the cheapest 0.1 mm-fine insurance on the bar

The Coffee Brush — Coffee Brush Ebony Wood Handle Professional Coffee Machine Cleaning Brush Barista Tool Firm But Gentle Bristles 34x30mm Head 195mm Length 0.0392kg Espresso Group Head Grinder Throat Portafilter Cleaning Made in China Wenzhou X Machinery Xsousvide is not gift-shop merch with hairs glued on a stick. The 195 mm length clears a commercial steam wand while keeping the head on the group shelf; the 34×30 mm rectangle covers portafilter lip and group ledge in one arc; the firm-but-gentle bristles sweep 0.1 mm baked fines off chrome without hazing it; ebony survives the 60°C radiant-plus-dishcloth microclimate where oak warps and PP chalks; and 39.2 g balances the wrist across 200 swipes a shift. Made by Wenzhou X Machinery and listed under XS Sous Vide's Coffee Machine > Accessories row, it ships beside tampers and knock boxes as the passive hygiene anchor in a barista close-out kit whose metric is "no baked fines on the lip at shot 200," not "looks nice on the shelf."