Applied the highest grade PBT double shot key cap of 1.5mm thickness / DYE Sublimation Editon Cherry MX Mechanical Switch Cherry original switch: This shows good durability (over 50 million clicks) to use the original MX switch of the German Cherry company. There are 4 DIP switches on the back of the keyboard. The user can set the desired environment through the DIP switch setting. Sound Absorbing Pad / infinite concurrent input / High-end FR-4 Dual Layer PCB Stepsculpture 2 / USB & PS2 Support