Filling, pouring, and sprinkling water with Sprout Ware? Stacking Cups turns bath time into play time. Sprout Ware? plant-based resin is BPA- and PVC-free, and has a smooth texture and simple design that is easy for little hands to hold. Baby also enjoys stacking and sorting all six sizes and colors, or sifting sand through the holes in the cups! The Sprout Ware? Stacking Cups stimulate baby’s sensory, movement, interactive, cognitive, creative, and naturalist learning pathways for early, whole development.