part · switch

Gazzew Boba U4T

Spec sheet

Type: Tactile
Top housing: Nylon
Bottom housing: Nylon
Stem: POM
Spring: 62g actuation · 68g bottom-out
Travel: 3.2 mm
Factory lubed: yes
Released: Jun 1, 2020

Full-sound tactile counterpart to the Boba U4 — same nylon housing, same pronounced round bump near the top of the stroke, but without the stem-mounted silicone dampening pads, so the bottom-out and top-out ring freely. The longer-pole stem that lets the pads' seats go unused also shortens total travel versus the U4. The result is a tactile with a deep, full-bodied thud on each keypress. Popular for typists who want a strong round bump without sacrificing acoustic character. Lubed at the leaf and spring bottom; slide rails ship dry, and spring-rattling on the upstroke is common and addressed with a thin oil on the spring.

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Mentioned in 12 articles

Ideas

Parts pairing for a split build: two independent halves, two independent decisions

A split board is two keyboards that happen to share a keymap. Most builders still buy parts for it like it's one — matching switches, ordering a single sculpted keycap set, and never touching the left half's tuning differently from the right's.

thockAug 26, 20269 min read

Split cross-section line drawing of a mechanical switch. The left half shows a stem with elastomer pads on the foot of its legs and the top of its rails, picked out in a dusty-rose splash; the right half shows a housing with a dampening ring seated at the floor. Rendered in a single warm-grey stroke with a brass-bronze theme dot at the upper right.

Deep Dives

What a silent switch actually silences — and what it can't

Every keystroke lands twice — once on the floor, once on the ceiling. Cherry molds an elastomer pad onto the stem to catch both; Gazzew fits a silicone one. The undamped Boba U4T shows what either approach is buying — about 14 dB on one tester's meter — and what it costs in travel, rebound, and a bump with nowhere left to go.

thockAug 19, 202610 min read

Three switch silhouettes in a row — a tactile, a silent tactile, and a linear — sharing one continuous housing outline drawn in a single warm-grey stroke, with a coral splash pooled beneath the middle silent-tactile silhouette and a brass-bronze theme dot at the upper right

Deep Dives

The Boba Family: One Housing Blend, Five Switches, and the Sound thock Is Named For

Gazzew designs, Outemu molds, and a plastic softer than nylon does the rest. Every Boba is the same chamber with something deliberately left out — and the pattern of subtractions is the whole family tree.

thockJul 27, 202610 min read

Line-drawing cross-section of an IBM Model M buckling-spring keyswitch, shown mid-buckle: a coil spring bowing sideways inside its guide barrel, handing off to a pivoting hammer/flipper on a fixed pivot, which strikes a raised contact pucker on a membrane sheet below — an amber focal dot and ring mark the strike point.

Deep Dives

How buckling-spring switches actually work

thock has already reached for the buckling-spring snap twice — once to describe a Topre dome, once to describe a click-bar's sharpness — without ever explaining what a buckling spring actually is. The mechanism predates both, and it is stranger and more mechanically honest than either.

thockJul 26, 202610 min read

Side-view cross-section of a heavy nylon-housing tactile switch — top housing, POM stem with a pronounced tactile bump geometry near the top of travel, stiff coil spring, and nylon bottom housing, rendered in a single warm-grey stroke with an amber splash across the bump-and-leaf contact zone

Deep Dives

Why the Durock T1's Bump Feels the Way It Does

The Durock T1 keeps turning up as the comparison point in other switches' deep-dives — the reference a reviewer reaches for when a bump needs to read as heavy and serious. It has never had its own.

thockJul 2, 202610 min read

Side-view cross-section of a nylon-housing tactile switch — top housing with a faint dashed ghost-ring marking an absent stem-mounted dampening pad, POM stem with a D-shaped flat-plateau tactile bump positioned high in the stroke, coil spring, and nylon bottom housing with a matching absent-pad ghost-ring at the floor, coral resonance arcs radiating above the top housing and below the bottom housing, rendered in a single warm-grey stroke with a coral splash across the plateau contact point

Deep Dives

Why the Gazzew Boba U4T Rings Where the Boba U4 Stays Quiet

Same housing, same bump position — the U4T's whole personality comes down to what Gazzew left out. Pull the dampening pads from a Boba U4 and the bottom-out stops being polite.

thockJun 29, 202611 min read

Switch cross-section diagram of the Gateron Lanes tactile mechanism — exploded side view showing the stepped tactile legs on the stem, the leaf-spring contact, and the housing halves rendered in warm-grey stroke with a coral splash at the stem shoulder

Deep Dives

Gateron Lanes: The Alps-Inspired Tactile Taking Over the Mid-Range

Gateron's Lanes draws its DNA from the Alps SKCM Orange — one of the most loved tactile mechanisms of the 1980s — and arrived in June 2026 with enough community conviction to sell out on first drop.

thockJun 18, 202612 min read

Side-view cross-section of a tactile switch — top housing, rounded-bump stem, spring, and bottom housing rendered in a single warm-grey stroke with a muted terracotta splash across the bump shoulder and a faint panda-style top/bottom contrast banding the housings.

Deep Dives

Why the Drop Holy Panda X feels the way it does

The Holy Panda was a six-month frankenswitch project for most of its life. The Drop Holy Panda X is the first version where the geometry, the spring tune, the housing pairing, and the factory lube were the spec — not the mod.

thockMay 12, 202613 min read

Vertical exploded-stack diagram of a mechanical switch, drawn in a single warm-grey stroke with horizontal dashed explode-lines and an ochre splash highlighting the cruciform stem top.

Guides

A beginner's guide to picking your first switch

Switches are the single biggest factor in how a keyboard feels and sounds, and the catalog has grown overwhelming. This guide narrows the entire market into three families, explains who each one is for, and gives a three-step path from curiosity to a confident first purchase. By the end, the reader can pick a category without second-guessing.

thockApr 30, 20268 min read

Cross-section diptych of two clicky switches — a click-jacket sleeve riding the stem rail on the left half and a horizontal click-bar leaf anchored in the housing on the right half, drawn in a single warm-grey stroke with an ochre splash spanning both click events and brass focal dots at each strike point.

Deep Dives

Why clicky switches still have a constituency

Linears and tactiles dominate the modern build conversation, and clickies barely appear in it. The reason is not that clicky switches have aged out — it is that the people who want them really want them, and the manufacturers know it.

thockApr 18, 202610 min read

Cross-section of a single Topre key position — a conical spring seated on a circular capacitive pad on the PCB, a rubber dome collared over the spring, and a slider riding the dome above, drawn in a single warm-grey stroke with a dusty-rose highlight where the spring meets the pad.

Deep Dives

How Topre's electrocapacitive switches actually work

Topre is not just another switch — it is a third sensing lineage, parallel to the MX-style contact switches and the Hall-effect newcomers. Understanding why HHKB and Realforce typists pay what they pay starts with the fact that a Topre keypress does not close a circuit at all.

thockApr 16, 202612 min read

Cross-section diagram of a switch housing showing where a film sits between top and bottom housing

Ideas

Switch films: do they actually do anything?

Thin POM shims between your switch housings cost five dollars and promise a tighter, better-sounding switch. The mechanism is real. Whether it matters on your specific switches is a separate question.

thockApr 13, 20268 min read

Gazzew Boba U4T appears in editor-curated build sheets.

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