Made from castor oil and infused with charcoal, these bristles are biodegradable. They have medium/soft bristles made from castor bean oil and blended with charcoal. Bamboo is naturally antimicrobial and a fast-growing renewable resource.
Insert on the bottom is made from cornstarch PLA and is required for the metal to fit and vibrate effectively.
Compatible with Phillips Sonicare 9-Series.
