This set of plastic cubes link together on all sides of each cube with circle shape cutouts. Easy for little hands to connect and twist apart. Great for counting to 100 by ones and tens, grouping and one-to-one correspondence. Each set includes 10 purple cubes, 10 yellow cubes, 10 red cubes, 10 blue cubes, 10 light green cubes, 10 dark green cubes, 10 orange cubes, 10 brown cubes, 10 black cubes, 10 white cubes, and activity guide. Each cube measures 0.75". Sold as 2 sets for a total of 200 cubes.