This cleaning brush is made of high-quality materials, strong and durable. The bottle mouth cleaning brush uses high-quality nylon bristles, which can firmly penetrate into the gaps. It can be rotated and replaced, it is convenient to switch, small and fast, suitable for all kinds of cup lids, cup mouths, spouts, cleaning gaps and corners. It is comfortable to hold and gentle to the touch. It is gentle on any surface and will not harm your household cleaning.