It is comfortable to use and enables users to tap the keyboard in a natural posture, It can prevent and effectively reduce the strain of wrist muscle by relieving the long-time fatigue of key input. The keycaps is made of high quality material ,will not easy to wear and excellent to contact. Ergonomic design, more comfortable typing, smooth lines Model:A58 Applicable models:Universal Type:Keycap Number of keys:78 Interface:USB Whether to support plug and play:Support Whether to support ergonomics:Support colour:Black Material:ABS Package Contents: 104 x buttons Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.