Razer's BlackWidow Lite TKL mechanical keyboard includes o-rings at $72 (Reg. $90)
Razer Mechanical Keyboard Enhancement Kit - купить кольца для механической клавиатуры на Razer.ru
Amazon.com: Razer Doubleshot PBT Keycap Upgrade Set for Mechanical & Optical Keyboards: Compatible with Standard 104/105 US and UK layouts - Classic Black : Video Games
Rosewill O Rings on the Razer Blackwidow Ultimate Elite (Green Switches) - YouTube
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 :