This slant board collapses to a thickness of just 3/4 of an inch and is very, very light! Great for traveling (from home to school, class to class, etc.) and can easily be stacked and stored in a classroom. Made of durable corrugated plastic, has attached plastic clamps that hold paper well, and includes non-slip "feet." Use for writing or holding materials to copy from. The low angle surface is approximately 20 degrees. The large slant board writing surface measures 12 inches by 12 inches.