Tupperware Domed Sipper Seals Set of 4 in White Tupperware Domed Sipper Seals Set of 4 in White Helps to minimize spillage while children learn to drink from a tumbler, tumblers not included Sippy tops measure approximately 3 inches in diameter Flat edge opposite drinking spout to minimize spills 2 small drinking holes in the spout, ideal for children up to 24 months