This brush allows for thorough cleaning of baby bottles with a sponge and brush. Suitable for both glass and plastic bottles. I am selling this as I have not had the opportunity to use it. It has been stored at home, so the adhesive on the opening of the outer bag has deteriorated and cannot be closed. It is sealed with tape. Please rest assured that the contents are unused. It will be shipped in simple packaging. Thank you for your understanding. Thank you for looking.