Trumpet Key Button Covers – Mica Sheet + Alloy Cap, 3.9mm Inner Diameter (Single or 3‑Pack)

Trumpet Key Button Covers – Mica Sheet + Alloy Cap, 3.9mm Inner Diameter (Single or 3‑Pack)

Name: Trumpet Key Button Covers – Mica Sheet + Alloy Cap, 3.9mm Inner Diameter (Single or 3‑Pack)
Brand: HomeDIYer
SKU: y20&1
Price: 16.0 USD
Availability: InStock

$16.00 USD

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By HomeDIYer^®

Quantity Discount Promotion

set:Small Button Caps (1 Pack)

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Illinois

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🎺 Trumpet Key Button Covers – Mica Sheet + Alloy Cap, 3.9mm Inner Diameter (Single or 3‑Pack)

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.

✨ Key Features – Trumpet Key Button Covers

🎵 Fits standard trumpet keys – Inner diameter approx. 3.9mm, outer diameter 16.9mm. Perfect for most student and professional trumpets.
✨ Mica sheet top – Durable, scratch‑resistant, with a natural pearl‑like luster. Matches traditional instrument styling.
🛡️ Alloy cap base – Lightweight (3.5g each) yet strong. Resists corrosion and stays securely on the key post.
🔄 Easy push‑fit installation – No glue or tools needed. Simply press onto the existing key post.
🎨 Classic appearance – Adds a clean, professional look to worn‑out or missing button caps.
🎺 Wide compatibility – Works on trumpet, cornet, flugelhorn, pocket trumpet, and other small brass instruments with similar key post size.

📏 Technical Specifications – Trumpet Keycap

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

🛠️ Easy Installation – No Tools Required

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.

❓ Frequently Asked Questions – Trumpet Key Button Covers

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.