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Your trumpet’s stock key buttons are worn, scratched, or just lack personality. These replacement keycaps combine a classic mica sheet top with a durable alloy cap, giving your instrument a fresh look and comfortable feel. Each cap measures approximately 16.9mm outer diameter, 3.9mm inner diameter, and 5.2mm in height – designed to fit standard trumpet key posts. The mica surface adds a subtle pearl‑like shine, while the alloy base ensures a secure fit. Choose a single cap to replace a lost one, or a 3‑pack for a full set. Also works on cornet, flugelhorn, or other small brass instruments with similar key dimensions.
| Parameter | Details |
|---|---|
| Product name | Trumpet key button cover / keycap |
| Material | Mica sheet top + alloy cap base |
| Outer diameter | Approx. 16.9 mm |
| Inner diameter | Approx. 3.9 mm |
| Height (overall) | Approx. 5.2 mm |
| Weight | Approx. 3.5 g each |
| Compatible instruments | Trumpet, cornet, flugelhorn, pocket trumpet (standard key posts) |
| Package options | Single cap / 3 caps / plus optional small brush for cleaning |
| Step | Action |
|---|---|
| 1 | Remove the old key button if present (gently pull or pry). |
| 2 | Align the new keycap over the key post. |
| 3 | Press firmly until it sits flush with the post top. |
| 4 | No glue or adhesive needed – friction fit keeps it secure. |
1. Will these keycaps fit my specific trumpet model?
Most standard trumpets (Yamaha, Bach, Jupiter, Getzen, etc.) use key posts with an outer diameter of around 3.8‑4.0mm. Our cap has a 3.9mm inner diameter, so it fits the vast majority. If your trumpet has larger or smaller posts, please measure before ordering.
2. Are these caps easy to remove if I need to clean under them?
Yes – they are held by friction only. You can gently pry them off with a flat tool (or your fingernail). Be careful not to scratch the metal.
3. What is the “21 small brushes” option mentioned?
Some listings include a pack of 21 small cleaning brushes (for valve casings, slides, etc.) as an accessory. If you see that option, it’s a convenient add‑on for general instrument maintenance.
4. Is the mica sheet real or synthetic?
It is a high‑quality synthetic mica (pearl) sheet – durable, consistent in color, and resistant to cracking. It mimics the look of natural mother‑of‑pearl without the brittleness.
5. Can I use these on cornet or flugelhorn?
Yes – most small brass instruments share similar key post dimensions. However, always verify the inner diameter requirement of your instrument.
6. Do I need to buy a full set (3 caps) or can I buy singles?
Both options are available. A 3‑pack covers the three main piston caps (first, second, third valve). Singles are good for replacing a single lost or broken cap.
