The Philips Avent Pkg Of 4 Natural Response Glass Baby Bottles is a set of four 8 fl.oz bottles designed for babies aged 3-6 months. These bottles feature soft anti-colic nipples made of silicone, providing a medium flow rate. The clear glass bottles are standard in size and are produced by the trusted brand Philips in the United States. This bottle set is ideal for parents looking for a reliable and efficient feeding solution for their little ones.