This translucent plastic abacus has a 5 column base and 50 pieces in different colors and shapes. A fun and useful material, it provides hands-on learning that works on children's classification and serialization skills. It comes with transparent activity sheets with increasing difficulty levels, which can be used on light tables. This abacus helps children acquire basic mathematical knowledge and boost their ability to focus and concentrate, while they have fun. Recommended age 3-6 years