Each Bottle: Includes silicone nipple, polypropylene cap, ring and stopper Made with high quality thermal shock-resistant borosilicate glass - Protective silicone sleeve helps prevent breakage and provides an easier grip BPA-free and phthalate-free. Bundle includes 4 Bottles, each bottle has a capacity of 4 oz Made in USA and France The perfect starter bottle for baby. The Lifefactory 4oz glass baby bottle comes with a silicone sleeve, polypropylene cap, ring, and stopper, and a Stage 1 (0-3 months) silicone nipple. These are wonderfully easy to clean: the bottle stays inside the silicone sleeve, and go right in the dishwasher.You'll appreciate the grippy surface of the colorful silicone sleeve, and you'll love the fact that you're using a glass bottle that is manufactured with high quality materials.