It is designed to be suitable for all bottle models. Thanks to the serrated soft bristles on the brush, your bottle is cleaned without scratching. It is recommended to clean the bottle after each use in order to prevent bacteria that may be caused by milk residues. , , It easily cleans products that are difficult to clean such as all kinds of feeding bottles, pacifiers, bottles and jugs. It is not absorbent. It cannot be used as a toy. Use of: Your bottle will be cleaned efficiently when you rotate the serrated soft-tipped brush so that it reaches all inner surfaces of the bottle & bottle. The teats will be clean when you gently rotate the tiny knurled part on the back of the brush and the residues inside the bottle teats.