Tool free installation. mouse pad can be clamped on your desk in seconds with No DAMAGE TO YOUR DESK. No need to drill holes in your desk.Position your mouse under desk shelf ; essentially expand space for holding a different things such as your speaker, phone, mouse or tablet.Ergonomic mouse tray keeps you in body postures for working or reading on computer screen; prevent shoulder, back, and wrist and injury from bad postures.You can clip it on your desk surface between 0.65 inch and 1.5 inch thickness, and can be installed for either right or left hand users. We DO NOT recommend using on table with edge slope and edge with decorative strip or glass office table.Rotates under the desk and when not in use. Buy 2 to make one keyboard tray.Weight: 1.2 lbscolour:Blackmaterial:plasticsize:25 x 19.5cmPackage Contents:1 x Mouse trayOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.