This unique classroom set of interlocking base ten pieces can be used for a wide variety of math instruction — whole-class, small groups, centers or individual exploration. The boxed set features 600 units, 200 rods, 20 flats and 3 cubes. The plastic set is washable and durable for years of hands-on activities. Size: 53.1 x 34.5 x 12.5 cm. Ages 6+.