Designed to work with all Ameda hygienic kit milk collection systems and breast pumpsnSize: M/L 30.5mmnWithout BPA or DEHPnEvery mother needs a good breast flange fit for greater comfort and better milk flow. Available in seven sizes. Designed to work with all ameda hygienic kit milk collection systems and breast pumps. Size: M/L 30.5mm. Without BPA or DEHP.