This set of base ten components conveniently interlocks to clarify place value, estimation, and operations concepts by enabling students to manipulate and visualize varying quantities with ease. More advanced students can explore spatial relationships and volume. Plastic set is washable and durable for years of hands-on activities. Set includes 100 units, 30 rods, 10 flats, 1 cube, and Base Ten book (LER 4296). For 3-4 students.