Help young students master early math skills with these cubes which are great for stacking. Easy for little hands to connect and twist apart. Great for counting to 100 by ones and tens, grouping and one-to-one correspondence. Features circular cutouts on each side for easy linking, and kid-friendly, appealing colours. Includes activity guide. Ages 5+. WARNING: Choking Hazard. 3/4". 10 assorted colours. 100 per set.