Items included: -Four 4-ounce/120mL glass bottles with “Flow 2” nipples -Four 8-ounce/240mL glass bottles with “Flow 3” nipples -Three 4-ounce/120mL bottle covers/holders -Three 8-ounce/240mL bottle covers/holders *Please note, two of these glass bottles do not come with an accompanying cover/holder! And the flow rate of the small and large bottle nipples are different.* These are in great condition and were barely used. The nipples are made of silicone and are BPA free. Both sizes of these bottles new without the covers are sold on Philips’ website for $29.95 for four bottles. From Philips Website: “Nipple releases milk when baby actively drinks. The Natural Response Nipple works with your baby's natural feeding rhythm, making it easy to combine breast feeding and bottle feeding. The nipple has a unique opening which only releases milk when the baby actively drinks. So when they pause to swallow and breathe, the milk pauses too. Natural latch on with breast-shaped nipple. The wide, soft and flexible nipple is designed to mimic the shape and feel of a breast, helping baby to latch on and feed comfortably. Designed to reduce colic and discomfort. Anti-colic valve is designed to keep air away from baby's tummy during feeding, to help reduce colic and discomfort.”