Spectra CaraCups Wearable Milk Collection, 28mm.Includes: – 2 Milk collection cups. – 2 Valve connectors. – 2 28mm flanges. – 2 Backflow membranes. – 2 Backflow protector caps. – 2 Silicone valves. – 2 Breast pump bases. – 2 Tubing adapter ends. – 2 Tubing.