2pcs/pack original D2FC-F-K (50m) blue dot mouse micro switch new model of 10m 20M 7N series 50 million times for lifetime Features: new product D2FC-F-K (50m), for lifetime can be up to 50 million times, the blue button, longer than the ordinary 20M life, and even, feel crisp, very comfortable! 7N 20M and OF slightly closer to the handle, relatively more crisp, feeling a little less lag rebound,Relatively slightly lighter! As long as the your mouse is using rectangular three pin micro switch, then you can use this one to replace it. Currently known to apply to the following mouse fretting changes: for Microsoft Red Shark IO1.1 (left and right buttons) for Microsoft Silver Shark IE3.0 for RAZER full range MX Series for Saturn Trackball for Mars Trackball G series for Apple G3 G4 G5 Package includes: (Without retail package) 2 x Original D2FC-F-K (50m) Mouse Micro Switch