Curved shape more suitable for the scalp. You can hold more hair with the 20mm bristles. Leaf-shaped, it makes each branch more flexible. Brush your hair more comfortably. Anti-knot bristle, flexible and resistant enough to be able to smooth all kinds of knots in the hair. HOW IS IT BIODEGRADABLE? 1.Composting condition: temperature 58 + -2ºC, with the action of microorganisms, the body can be biodegraded to C02 and H2O. 2. Landfill: It takes 2 to 5 years to degrade in the landfill. The end result does not cause groundwater contamination.