Get a posture-perfect writing surface. A 20 degree angle compensates for fatigue in the back, neck, shoulder and eye muscles. Enhances concentration too. Made of sturdy aluminum. It folds flat for storage. Allows for a range of angle adjustments from 20 to 40 degrees. Surface is 12" x 12" (30.5 x 30.5 cm). Sold as Single Unit. Angle adjustable from 20 to 40 degrees. Velcro strips make angle adjustments a breeze. Sturdy, smooth aluminum construction will not shatter or crack. Lightweight board weighs only 30 ounces.