Make the most of playtime with Nuby's Silicone Stacking Cups. Designed to help encourage cognitive development. the Silicone Stacking Cups help develop children's fine motor skills. including developing the hand-eye coordination that will eventually help with future tasks like self-feeding. With engaging colors and various sized pieces. baby will hone color recognition and size sequencing skills while exercising their creativity. As little ones sit and play. the stacking toys also help build core stability. With children's safety in mind. Nuby's Silicone Stacking Cups are made from 100% silicone that is BPA-free and dishwasher safe. so cleanup is easy. For even more fun. Nuby's Silicone Stacking Cups can be used during bath time. too!