Only compatible with Chuchu Wide type PPSU Baby Bottle Made of odorless, transparent silicone for strength and durability Super Cross Cut teat is designed to avoid choking when not sucking Same sucking pattern as natural breastmilk, controls milk flow according to baby's sucking force The most natural sucking control action to promote natural oral muscle development Suitable for babies of all ages, no need to differentiate between large, medium and small sizes