COMPATIBLE WITH LAIFEN ELECTRIC TOOTHBRUSH: only compatible with Laifen. ECO-FRIENDLY: ponpace biodegradable toothbrush replacement head is made of 100% bamboo body, only bristles are made of nylon (about 15% of the weight of the toothbrush head). BE GENTLE ON ORAL CAVITY: ponpace bamboo replacement head is carefully polished with a food grade coating to make the entire brush head very smooth, combining soft bristles, bring a better and safer experience to your oral cavity. DOUBLE-POINTED CHARCOAL-INFUSED BRISTLES: Fresh breath and deep cleaning of teeth. RECYCLABLE PACKAGING & INDEPENDENT PACKAGING: Independent packaging ensures the safety and hygiene of each electric toothbrush replacement head, all packaging 100% plastic free. Our electric toothbrush heads use a new bio-based renewable bristle, the main component is castor oil. The use of plant-based castor oil bristles can reduce the dependence on fossil resources and reduce the use of fossil raw materials in the context of carbon neutralization. Body is made of 100% bamboo, no plastic inside. Compatible with Laifen.