Features:  - Quality 100% food grade silicone - Compatible with all Generation 3 Silicone pumps and bottles - Eliminates messy transfers of breast milk - Quick and easy screw on, Screw off transformation - Comes with a clear cap to prevent dust from landing on the teat - between uses. - Safe in microwaves, boiling water and sterilizers. - BPA, PVC and phthalate-free