Explore differences in weight with 12 wooden cylinders, then match alike ones to create six pair. Plastic grips make grasping and holding easier. Check color-coded dots on bottom of cylinders to insure accurate matches. Develops eye-hand coordination, dexterity, concentration, memory, perception, and matching skills. Wooden tray measures 10″L x 7 3/4″W, cylinders 2 3/4″H.