This set, made in the USA from 100% recycled milk jug, contains six graduated cups and dozens of possibilities for bath and play time. Scoop and pour water, turn them upside down to stack them, or just sort sizes to nest them inside each other. The Stacking Cups are colorful and fun, and help with counting and math concepts. Each cup is numbered on the bottom from 1 to 6 - fill cups 2 and 3, for example, and they will equal the volume of cup 5, etc. A wonderful bath time toy! For about ages 6 months and up while supervised in the bath.