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 that ordinary brushes cannot reach. The foldable brush is comfortable to hold and gentle to the touch. It is gentle on any surface and will not harm your household cleaning. It is ideal for any bottle type, small and light. Fits to the mouth of the cup for easy cleaning, clean the spirals, gaps and corners that the sponge can't reach.