Allsop's Wrist Assist is ergonomically designed to promote optimum wrist position and arm movement when mousing. It provides smooth mousing , no edge to slide off and it's easily adjustable wrist cradle allows you to change the position of it to anywhere along the length of your arm. Designed for use with most mice, calculators, telephone and other desktop data entry devices. Designed to slide as smoothly as your mouse, the Wrist Assist is a product you will wish you got sooner!