Your Premium Nurser Gift Set Includes: 2 - 4 oz premium Nursers with NaturaLatch silicone nipples (slow flow); 2 - 8 to 10 oz premium Nursers with NaturaLatch silicone nipples (slow flow); 15 - 4 oz Drop-Ins pre-sterilized disposable liners; 15 - 8 to 10 oz Drop-Ins pre-sterilized disposable liners; 1 - breast pump adapter ring; 1 - liner ring; 2 - sealing disks; 2 - nipple rings; 1 - instruction booklet. For best performance, use only Playtex Drop Ins Pre-Sterilized Disposable Liners with Playtex Nursers. Colors may vary. Pediatrician recommended. Clinically shown: mimics breastfeeding; significantly reduces gas and colic. Bisphenol-A free. Phthalate free. BPA free. Pre-sterilized disposable liners. Keep air out for more comfortable feeding. Includes: breastmilk storage kit. The Playtex Drop-Ins System is designed to help baby switch between breast and bottle. Patented NaturaLatch Nipple: Clinically shown to mimic baby's latch-on like the breast; Slow-flow nipple designed to replicate the natural flow of the breast, so baby takes in the right amount. Compatible with the Playtex Nursing Necessities Breast Pumps: Just pump, store, and feed using the One Step Breast Milk Storage Kit (sold separately); Easy to store and freeze directly in the liner. Playtex Drop-Ins disposable liners are: pre-sterilized for a clean bottle any time; 100% leak-proof guarantee; pre formed for easy one-handed assembly and clean-up; Bisphenol A free (BPA-free) and phthalate-free. Generations of moms have trusted the Playtex Drop-Ins System with their babies, and it continues to be the no. 1 selling bottle system (based on sales volume). It is also pediatrician recommended. Two recent clinical studies confirm that the Playtex Drop-Ins System provides significant colic reduction and mimics the natural feeding patterns of breastfeeding. Clinically Shown Reduces Gas and Colic: In a clinical study. 8 out of 10 mothers indicated that their babies showed fewer signs of gas. colic, and other feeding discomforts. Clinically Shown to Support Baby's Own Natural Feeding Pattern and Support Breastfeeding: Baby sucks and swallows in a coordinated rhythm that is similar to how they feed from the breast; Baby breathes more naturally; Baby can control the flow of milk, so he/she takes in just the right amount. Liners made in USA. Made in China.