This is a set of 4 KAILH MUTE silent micro switches for mice, made by KAILH. Kailh mute switches come in red and yellow button versions. The yellow switch has a quieter click sound and a long lifespan of 20 million clicks. The red switch, by comparison, has a click lifespan of 8 million clicks. The size is 6.2mm x 6.2mm x 7.3mm. The height from the circuit board to the tip of the switch is 7.3mm. Silent operation is possible by replacing the switches commonly used in mice, such as those made by Omron and Panasonic.