It's a special brush with capillary bristles, incredibly soft and able to perform a perfect cleaning of the teak surface, without affecting the coments or the wood grain. The other brushes used so far unfortunately exert an abrasive action that digs the teak. "Teak-brush" does not damage the teak with its capillary threads. The body of the brush is made of wood to prevent it from slipping out of your hands when using the appropriate products.