[Keyboard Switches]- GATERON Optiacal Silver Keyboard Switches – Made for DIY enthusiasts to obtain satisfying typing feelings with more affordable options as they wish. [Tip!] This optical key switches can't interchange for custom mechanical MX switches. Such as GK61, GK64 can't use this switch. The bottom of the switch is a different structure with a hole that can let infrared path. [Compatible] Gateron Optical Keyboard Switches Compatible with SMD optical keyboards, such as SK61 /SK64 /X-bow Nature Knight. [Durability] Approximate lifespan of 80 million times of keystrokes based on laboratory durability test. Meanwhile, a single package box comes with 35 switches with a plastic tray that can securely house switches and can be served as a lubing station if necessary. So the switches will not shake for better performance. Actuation Force: 35±15 gf, 35pcs included in each pack, Stem Material: POM, Top Housing Material: PC, Transparent, Bottom Housing Material: Nylon, Black, Pre Travel Distance: 1.0±0.4 mm, Total Travel Disatance: 3.2 mm Max, Spring: Spring steel, Pre-lubed: No, LED Support: SMD