Selected Silicone This nipple suction cup is made of high quality silicone, smooth surface, no burrs, fine workmanship. Easy to use Simple to operate, one press and one suction, after suction, you can press the nipple clamp head several times to make it more firm. Advantages of breast pump Small and cute, easy to carry, made of high quality silicone, easy to clean, can be rinsed directly with water. Warm tips: due to manual measurement, the data may have error, is a normal phenomenon!