Lifefactory baby bottles are made of the highest quality, thermal shock resistant borosilicate glass. This allows the bottles to transition safely from freezer to boiling water. The protective silicone sleeve improves grip and protects against breakage. Compatible with most major breast pumps. Set includes 2 x 120ml bottles, 2 x 265ml bottles, 2 x Stage 3 Nipple, 2 x Sippy Cap and 2 x Flat Cap. Bottles can be used to freeze liquids. Great for a gift – perfect for baby showers!