No flimsy frames--each die cut as a solid rectangle! Set features two sizes of magnetic, dry-erasable frames! Large frames help teachers demonstrate base ten and operation concepts on the classroom whiteboard. Smaller frames are for student practice on lap boards. Includes 2 large demo frames, 4 student frames, and 60 magnetic two-color counters (double- sided red/yellow)! Student boards sold separately. Demo frames measure 15"W x 6.19"H. Ages 5+/Grades K+