Anti-colic valve, Easy to hold, Helping reduce colic, gas, and fussiness, Natural latch on, No-drip teat, Quantity: 4 bottles + 1 Soother 0-6m + 1 bottle brush, Silicone Natural Response 2 x Teat Flow 2 for 125 ml bottle, 2 x Teat Flow 3 for 260 ml bottle