This 21.59cm (8½”) tall balance teaches students the relationship between numbers in a visual and concrete way.  Students can easily see the change in relationship between numbers as they manipulate the balance.  Set includes balance, four plastic sliders, and twenty 10g weights. Hanging Platform weights measure  1.9cm X 13.65cm  (3/4″ x 5 3/8″). Ideal for Grades 3-6.