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. Benefits: 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; Details: 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);.