Learning to drink from a straw is an important developmental milestone that develops lip rounding and promotes speech development. The ezpz Mini Cup + Straw Training System teaches toddlers to drink from an open cup and safely learn to use a straw. Helps toddlers succeed with the 3-Phase Developmental Drinking Method (by Ms. Dawn Winkelmann, M.S, CCC-SLP) Straw serves as both a Beginner Training Straw + an Advanced Training Straw Reduces spillage Dimensions: Cup (2.5 x 3.1), Straw (4.3 x 0.35 in), Lid (1.4 x 2.1) Portion Size: 4oz 100% Silicone (BPA, BPS, PVS, phthalate and latex free) Dishwasher safe Built to last (silicone will not wear, fade or corrode)