Efficient design allows you to adjust both height and tilt with just a twist; simply loosen knob, position tray as desired, then re-tighten knob. Mousing surface can be positioned left or right. Gel wrist rests with antimicrobial product protection inhibits the growth of microorganisms, such as bacteria, that can cause stains, odors and product degradation. Leatherette wrist rest cover is more durable than fabric and easier to clean.