Dual HygieniKit Milk Collection System with CustomFit Flange System with One-Hand Manual Breast Pump Adapter. Includes: (2) 25.0 breast flanges, (2) 30.5 mm breast flanges, (2) 28.5 mm flange inserts, (2) Silicone diaphragms, (2) 4 oz./120 mL bottles,(4) White valves, (2) Adapter caps, (2) Silicone tubings, (2) 2-piece lock-tight bottle caps, (1) One-Hand Breast Pump Adapter, (1) Instructions for use.