This set of plastic cubes links together on all sides of each cube with circle shape cutouts to help children build fine-motor skills. Easy-to-use design is perfect for little hands to connect and twist apart with minimal effort. Cubes are excellent for counting to 100 by ones and tens, grouping and one-to-one correspondence. Included activity guide helps encourage a fun learning experience. Cubes are designed for children ages 5 and up.