OptiMA 9" x 12" Music Staff Dry Erase Lap Boards Double Sided (15 Pack). Music Staff Dry Erase Lap Boards (15 Pack) MADE IN THE U.S.A. Music staff print is under a clear protective dry erase writing surface so it will never come off. Not a screen print Writing surface is highly resistant to ghosting. Erase clean after every use and before storage for best results. Packed 15 Double Sided boards per Pack. In Stock - Ships in 1-2 Business Days.