Amazon.com: ENHANCE Mechanical Keyboard O Ring Ultra-Quiet Switch Dampeners Damper Firm 50A Clear (140pcs), Key Cap Remover, Cleaning Brush, Cloth and Accessory Bag - Mod Kit for Cherry MX, TTC, Kaihua :
Mechanical Keyboard Cherry Mx Switch O Ring Noise Absorber O-ring Damper Noise Reducing Rubber O Rings - Keyboards - AliExpress
BUDGET]KEYS Translucent O-Rings (120) | Candykeys
A pack of 110 mechanical keyboard universal switch key caps silicone O-ring keycaps rubber muffler coils to shorten keystrokes