Phenolic tray with angular mouse area, durable, vibration-free Viscoflex memory foam, positive angled full length wrist supports Ball bearing glides, lock out feature, smooth action, low profile Height adjustable to 6", rotates, positive/negative tilt Tray dimensions: 28" W x 9.5" D x 1" H Track: 21" D x 9" W x 4.5" H Weight: 21 lbs.