The XL slant board collapses to a thickness of just 3/4" 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, it 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 18"w x 12"h.