The medium bamboo toothbrushes from Tropic have bamboo handles and medium bristles of bamboo fabric and nylon. The box is made out of 100% recycled material. Why should you change to a bamboo toothbrush? Dentists suggest we renew our toothbrushes every 3-4 months so it can make a huge difference if people own a biodegradable toothbrush instead of a plastic one that could take up to 1000 years to decompose in our landfills. Even after all that time, chemicals will live on in our nature. It also takes a lot of energy to produce the plastic brushes while the bamboo brushes are 100% natural. Bamboo is known for it's antibacterial qualities: “Another advantage of bamboo is that it is naturally antimicrobial. There’s a reason cutting boards and kitchen utensils are made out of wood and bamboo. Unlike plastic, properties inside the bamboo kill bacteria that penetrate it’s surface, providing long-lasting protection against harmful bacteria.” Our dream is to have everyone team bamboo! Or at least switch from team plastic.