Contains: 2 pump adapters; 6 liner rings; 6 sealing caps; 10 Playtex Drop-Ins 4 oz liners. Pump, store, feed in one Drop-Ins liner. No Transfer, No Spill: Adapter rings allow use with most pumps (Pump, nurser and nipple not included); 100% leak-proof guarantee; drop liner into Nurser and feed; freezer safe. Bisphenol-A free. Phthalate free. BPA free. Pump, Store and Feed Directly from One Liner: Fits easily with most pumps, including Medela, Evenflo and Lansinoh; Pre-sterilized liners; Freezer safe; No pouring or spilled milk; No extra bottles needed for storage; No bottles to wash. Clinically shown to reduce colic. Mimics breastfeeding. Guaranteed leak-free. BPA and phthalate free. Liners available in 4 oz and 8 oz. Note: Only Playtex liners are guaranteed to seal with the Playtex One Step Breast Milk Storage Kit. Other liners are not made to the specifications of Playtex liners and are not guaranteed to work. Includes: 2 Pump Adapters: Adapt the storage kit to allow use with non-Playtex breast pumps. (Fits most pumps, including Medela. Evenflo and Lansinoh. (Note: System is not compatible with Avent or The First Years pumps)); 6 Liner Rings: Allow you to pump breast milk directly into the liner; 10 Playtex Drop-Ins Pre-Formed Liners (4 oz): Liners are pre-sterilized, disposable & freezer safe making them the perfect way to store and feed breast milk to your baby; 6 Sealing Caps: Securely store pumped breast milk in the liner. Does not include Playtex Nurser bottle holder, nipple ring, nipple, or breast pump. Liner rings, sealing caps and pump adapter made in China. Liners made in USA.