Manufactured especially for manual or electric breast pump. They can help collect breast milk, bring more conveniences. Made of food grade silicone material, they are safe and durable as well as practical for use. Its anti backflow design allow you to collect breast milk in a more clean and easy way. Features -Material: Silicone -Size: 4.00X2.50X2.50cm;/1.57X0.98X0.98in; - Comes with 5 pieces in total, enough quantity for you to use, or replace. - High-qualitysilicone material ensure the safety and heathfor both baby and parent. - It is suitable for manual and electric breast pump. Easily meet your different needs. - Its all surfaces are polished with no burr, no harm to skin, safe to use. -Clean it with soapy water and rinse with clean water. Do not use hard brushes.Packing list5 x breast pump valves