Switch Keycap O-ring Sound Dampeners White For Mechanical Keyboard Keys 104-pieces,key Cap Rubber O-ring Switch Buffer - Keyboards - AliExpress
Razer BlackWidow Lite review: A highly portable mechanical keyboard | Expert Reviews
Amazon.com: ENHANCE Mechanical Keyboard O Ring Ultra-Quiet Switch Sound Dampeners Kit Soft 40A Clear (140pcs), Key Cap Remover, Cleaning Brush, Cloth and Accessory Bag - Mod Kit for Cherry MX, TTC, Kaihua :
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Amazon.com: ENHANCE Mechanical Keyboard O Ring Ultra-Quiet Switch Sound Dampeners Kit Soft 40A Clear (140pcs), Key Cap Remover, Cleaning Brush, Cloth and Accessory Bag - Mod Kit for Cherry MX, TTC, Kaihua :
O-Ring Install - Full Keyboard - All Sizes
Razer's BlackWidow Lite TKL mechanical keyboard includes o-rings at $72 (Reg. $90)