Two low friction ball bearing slides for installation and storage below work surface Pull out mouse tray (mountable left or right) Palm rest with pencil/pen compartment Keyboard platform accommodates a variety of different keyboard shapes Dimensions: 20.6"w x 12.5"d x 4.0"h Weight: 4.78 lbs / 2.17 kg Volume: 0.42 ft3 / 0.01 m3