The Twistshake Black Glass bottle is made of borosilicate glass which is a very strong and lightweight material. The ergonomic design of the bottle makes it easy to grip and is coated with a removable, removable biphenol A-free silicone film that protects little one's hands from heat. This bottle is ideal for nursing babies, since the shape of the nipple reminds the mother's breast and works as a preventive against colic that affects many nursing babies, thanks to its anti-colic valve that prevents air inhalation leftover reaches your baby's delicate stomach. Naturally, it is possible to replace the nipple with other d our pacifiers so that the child grows with the use of the bottle. This bottle is naturally odorless and does not contain harmful chemicals such as phenol A, PVC or phthalates. The silicone in the bottle is labeled ML and US FL. The bottle can be heated in the microwave and has the ability to go from the freezer to boiling water thanks to its resistance against heat. Thanks to being made of borisilicate glass, the bottle is scratch resistant. The glass bottle container can be washed in the upper section of the dishwasher, but we recommend that you wash the other bottle components by hand, as they may discolor when washed in the dishwasher. Features: Heat resistant borisilicate glass. Medical grade silicone teat: size M (2 + m). Anti-colic - Twistshakes anti-colic valve prevents colic with a free flow of food. Extra wide bowl neck - easy to fill and wash. Toilet. Light weight. Ergonomic design with removable silicone liner - easy grip for baby and adults. Quality grade ML and US FL. Biphenol A free - safe for you and your baby.