12" x 18" Double Sided Student Lap Board with Ghost Grid Lines Made in the U.S.A. Double Sided - Gray Ghost Grid on Side A - Plain White Writing Surface on Side B 14 Blocks High x 21 Blocks Wide; 294 Blocks Total Gray Grid is Roughly 3/4" x 3/4" - Covered by our exclusive clear dry erase writing surface. 11 13/16" x 17 7/8" x 1/8" Thick. Each sold separately.