System Includes: 8 oz Angled Bottle; Silicone Nipple; Tri-Flow ring, hood & sealing disk. Tri-Flow Nipple System. 1 Nipple, 3 flow rates. Fits standard bottle. Adjusts to match your baby's changing needs. Rotate Nipple: Slow (0-3 mos); Medium (3-6 mos); Fast (6+ mos). Adjusts to match mother's flow for a more natural feeding experience. Less gas. Less confusion. Ring & nipple work with standard bottles. Mother's breast milk at different rates - shouldn't your baby's bottle? Tri-Flow Nipple System is the only system that adjusts to match mother's flow rate. Features: Soft, rounded tip helps baby latch on; Clear ounce/ml markings; Sealing disk for airtight milk storage; Unique Tri-Flow design reduces gas and nipple confusion; Angled bottle reduces air swallowed and helps prevent ear infections; Bottle is safe for storing and freezing breast milk. Ideal for moms planning to switch between breast & bottle feeding. Natural choice of certified lactation consultants, moms and babies.