Amazon.com: 200pcs Rubber O-Ring Keyboard Switch Dampeners Make Your Mechanical Keyboard Quieter with Keycap Remover Suitable for Cherry MX Key Kit Dampers 40A-L-0.2mm Reduction (Red) : Electronics
DANCO #40 O-Ring (10-Pack) 96754 - The Home Depot
Wholesale Mechanical Keyboard Keycap 40A Silicone Rubber O Ring for Cherry Mx - China Wholesale Mechanical Rubber O Ring, Keyboard Keycap Rubber O Ring | Made-in-China.com
PTOU-40A | O-Ring Union High Pressure Fitting - Threaded, PTOU Series | Fuji Special | MISUMI
X1 Tools R-22 O-Ring (ID: 28 mm, CS: 3.5 mm, OD: 35 mm) (40 O-Rings), 40PK X1E-CON-ORI-RUB-0022x40 | Zoro
Red Color Silicone 40A O Ring - China O-Ring, Auto Parts | Made-in-China.com
ENHANCE Mechanical Keyboard O Ring Ultra-Quiet Switch Dampeners 40A Clear (140pcs) , Key Cap Remover , Cleaning Brush , Cloth and Accessory Bag - Mod Kit for Cherry MX , TTC ,
Rubber Ring Keyboard Switch | Rubber Ring Switch Cherry | Ring Dampeners Keyboard - Gaskets - Aliexpress
Glorious sell 40A/70A O-Rings at both 1.5 and 2.5mm for $10. Thought I'd mention this as usually people only talk about WASD. (link in comments) : r/MechanicalKeyboards