The Joovy Boob Baby Bottle is the most innovative baby bottle on the market today. For this set, Joovy carefully selected the 13 primary items you'll need to get started bottle feeding. You will love the ease of use, simplicity and functionality of the Boob system including the nipple design. one-piece patented CleanFlow? Vent System, bottle and insulator. This Boob PPSU Starter Set includes: (1) 9oz./260ml PPSU Bottle with stage 2 nipple (1) 5 oz./160ml PPSU Bottle with stage 1 nipple (1) Sealing Cap (2) CleanFlow Vents (1) Stage 1 nipple (1) Stage 2 nipple (1) Stage 3 nipple (1) Stage X nipple (2) Stage 0 nipples (1) Nipple Brush (1) Bottle Brush