The Philips Avent Anti-Colic Bottle is a set of four 9oz bottles with AirFree vent technology designed to reduce colic and discomfort in babies. These wide-neck bottles are made of BPA-free plastic and feature a breast-like nipple made of silicone, suitable for babies aged 1 month and older. The clear bottles are microwave and dishwasher safe, making them convenient for busy parents. The Philips Avent Anti-Colic Bottle set offers a capacity of 260ml per bottle and comes in a box containing four units.