Key switch tester is a kit to try mechanical switch for someone gonna buy a mechanical keyboard. Premium Quality and Design:Key switch tester is equipped with transparent key caps, ABS material, which allows you to easily understand the color of each key. Removable Design:The shaft body on the shaft tester SUPPORT disassembly and can be replaced at will. Before the new product is used, there is a protective film on the acrylic sheet, which can be completely transparent by tearing it off when in use. It can provide real key feeling and mechanical keyboard sound, and help you choose the type of switch you like. Specification: 1. 4 keys: optical-black/blue/red/brown 2.kailh box 4 keys: box-black/white/red/brown 3.cherry 4 keys: cherryMX-black/blue/red/brown 4.cherry 6 keys: cherryMX-black/blue/red/brown/silver/silent red 5.+razer 8 keys: optical-black/blue/red/brown/green/white/yellow/razer green 6.cherry+kailh 8 keys: cherryMX-black/blue/red/brown + box-black/white/red/brown 7:cherry+ 8 keys: cherryMX-black/blue/red/brown + optical-black/blue/red/brown 8.+kailh 8 keys: optical-black/blue/red/brown + box-black/white/red/brown 9.kailh box 9 keys: box-black/white/red/brown/yellow/orange/blue/jade/navy 10.cherry 9 keys: cherryMX-black/blue/red/brown/white/milk/green/gray/silver 11.cherry 12 keys: cherryMX-black/blue/red/brown/white/milk/green/gray/silver/silent red/silent black/RGB silver Size Chart: Size: approx. 8cmx3cmx3cm/3.14x1.18x1.18inch Package Includes: 1 Piece Key Switch Tester