Less frustration, more learning with chunky-sized math manipulative. Use Jumbo Cubes for counting, one-to-one correspondence, cardinality and comparing. Jumbo Unifix Cubes snap together easily and stay connected. Cubes are 1 1/2 inch on all sides. 20 cubes. 4 colors. Activity Ideas included. Grades pre-K+ Manufactured by Becker's School Supplies - Education. Made in China.