Demonstrate base-ten number concepts right on the whiteboard. Giant magnetic ten-frames and colorful discs let students and teachers explore base ten and other number and operations skills as a group. Set includes 4 magnetic frames, 40 discs (20 green, 20 blue) and an instruction guide. Frames measure 12.25 x 5 in. Size: 33 x 14 x 4.5 cm. Ages 5+.