Brush Naked Bamboo Toothbrushes feature a 100% bamboo handle and BPA-free DuPont nylon bristles. The medium and soft bristles now contain 25% Castor Bean Oil which means less carbon is used in making the bristles. Each brush is wrapped in 100% biodegradable/compostable cello which is made from wood and cotton pulp. The packaging is compostable and biodegradable. Each bamboo toothbrush is naturally anti-bacterial.