Untreated wooden handle with sisal plant fiber bristles (agave plant). This brush is 100% Biodegradable! Multipurpose: Great for dish, vegetable, or household cleaning! We've even had customers use it as a body brush remove dead skin and toxins and improve lymphatic functions. Longevity: Can be used for up to 6 months. Do not leave any of the wood parts soaking in water, the wood will absorb water and it will cause the wood to swell and crack.