A greener alternative to the billions of plastic toothbrushes discarded annually, these toothbrushes have a high-quality and easy-to-grip curved handle that is made entirely out of certified 100% organic, wild, giant Moso bamboo on which no pesticides or fertilizers are ever used Plus the bristles are made of 62% castor bean oil and 38% nylon and are biobased, but not biodegradable It's not perfect, but it's a step in the right direction (Please beware of other companies selling 'biodegradable bristles' as no such thing currently exists ).