Standard Collection Combo Kit (One-Piece flange, Double)

2 standard thread bottles (4 oz.) with bases, 2 One-piece Breast Shield Bodies (25mm) with standard bottle adapters, 2 Silicone Flange Inserts (23mm), 4 membrane valves, 2 silicone lip valves, 2 diaphragms, 2 diaphragm caps.