Wash, rinse, repeat with the Dish Brush Replacement Head. Brushes bristles are made of tampico (from the agave plant) and the base is made of beechwood. Each brush head lasts about 2-3 months with daily use and good care. Tip: Do not leave any wooden parts soaking in water as the the wood will absorb water and swell, causing cracks. Hang or place upright to dry after using. How to dispose: Once worn out, the Dish Brush Replacement Head can be composted.