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 Cloth Tie strips make angle adjustments a breeze Sturdy smooth aluminum construction will not shatter or crack Lightweight board weighs only 30 ounces