Learning Resources Interlocking Base Ten, 50 Rods Plastic 1 x 1 x 10 cm rods are washable and durable for years of hands-on activities Use with Interlocking Base Ten Units, Flats and Cube Great for hands on activities Units are made of durable, washable plastic for years of hands-on activities Includes 50 Base Ten rods that conveniently interlocks with other base ten components Use with Interlocking Base Ten Units, Cubes and Flats Grades 1+ / Ages 6+