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 linesModel:A58Applicable models:UniversalType:KeycapNumber of keys:78Interface:USBWhether to support plug and play:SupportWhether to support ergonomics:Supportcolour:BlackMaterial:ABSPackage Contents:104 x buttonsOnly 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.