Large 11" x 17" x 1/8" Thick. Double-sided music staff lapboards with 4 sets of music staff lines! Made with a sturdy hardboard with a dry-erase writing surface on both sides. One side has 4 sets of music staff lines and the other side is a plain white dry-erase writing surface. These are non-magnetic with a non-ghosting writing surface. The print is protected by an ultra-clear dry-erase writing surface so it will never scratch off.