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