It is a bottle brush made of coconut fiber with a wooden handle. Even items that are difficult to clean with ordinary brushes and sponges, such as my bottles, glass bottles, and vases, can be easily washed with this long-handled bottle brush. Compostable and biodegradable, this bottle brush can be an alternative choice to plastic brushes. You're one step closer to a plastic-free & zero-waste lifestyle. [Advice] Avoiding immersing the handle in water will extend the life of the brush. After use, store in a well-ventilated place and dry thoroughly.