Avent Natural Teat, SCF655/23, soft and anti-collapsible nipples are designed to meet your baby's developing needs in his early development stages. It is made from material that is bite resistant and long lasting. It is a flexible teat that does not collapse while feeding, but ensures comfort for baby's delicate gums and teeth. It only allows required flow rate as needed by your baby according to his age. It is compatible with other Natural range products from Philips Avent. It is a pack of 2 Avent Natural Teats for 3 months and older babies.