Our Standard Phenolic (PHO) Keyboard Tray provides maximum comfort and flexibility when using a keyboard. The tray is made of sturdy Phenolic and does not bend or vibrate when in use. The convenient adjustable control knob is easy to reach, located at the rear of the tray for simple spring assisted height adjustment up to five inches. The sturdy all steel 22″ horizontal ball bearing track offers friction and vibration free operations. The Phenolic tray includes a full length Viscoflex Wrist Support and is capable of positive and negative tilt of fifteen degrees and rotates 360 degrees. Phenolic Mouse Platform swivels and rotates minimizing reaching. The mouse platform can be attached to either side of the keyboard tray with plastic fence rail which keeps mouse from falling off the platform. The mouse platform comes with a Viscoflex mouse pad, soft to the touch and comfortable to use. Covered with easy to clean black Lycra fabric, Visco Elastic Memory Foam meets Cal 117. Viscoflex Wrist Pad is licensed under patents no. 5,131,614 and 5,228,655. AKA unit meets BIFMA/ANSI standards. Some assembly and installation required. All mounting hardware included. Five Year Warranty.