The encoder can be commonly used as long as the encoder of your mouse have the same height with it (Distance from board surface to center hole) So far known for: for Razer Deathadder 2013, for Razer Krait 2013, G Pro Wireless, M170, etc., Specifications: Height dimension: 8mm Customized high life 48 million times Relatively high precision, slightly for stronger scale Package includes: (Without retail package) 2Pcs x TTC 8mm Yellow Core Mouse Encoders