These stackable cubes are easy for little hands to connect and twist apart. Great for counting to 100 by ones and tens, grouping, and one-to-one correspondence. Cubes link together on all sides of each cube with geometric shape cutouts for more complex patterning activities. Details: Includes 10 colors 0.75" x 0.75" (1.905cm x 1.905cm) 100 cubes Plastic