x2 Replacement FSC Certfied bamboo toothbrush heads for the Philips Sonicare Series 6, infused with Japanese Binchotan Charcoal x2 replacement heads for the Philips Sonicare Series 6 electric toothbrush. For the following models; HX9322, HX9331, HX9332, HX9334, HX9336, HX9340, HX9342, HX9350, HX9351, HX9352, HX9361, HX9362, HX9371, HX9372, HX9381, HX9382, HX8923, HX8923, HX8911, HX8918, HX6710, HX6712, HX6722, HX6730, HX6732, HX6733, HX6750, HX6761, HX6781, HX6782, HX6780, HX6902, HX6903, HX6910, HX6911, HX6920, HX6921, HX6930, HX6932, HX6934, HX6950, HX6952, HX6970, HX6972, HX6973, HX6985, HX6992, HX9110, HX9111, HX9140, HX9141, HX9142, HX6201, HX6211, HX6212, HX6220, HX6231, HX6221, HX6250, HX6252, HX6253, HX6530, HX6510, HX6511, HX6512, HX6552, HX6311, HX6320, HX6322, HX6330, HX6340, HX3211, HX3281, HX3631, HX3650, HX3100, HX3120, HX3130. Bamboo Toothbrush Heads, bristles with Japanese Binchotan. FSC Certified Bamboo, with a cornstarch inner and nylon bristles infused with Japanese Binchotan from DuPont. The heads are 100% bamboo and make up 85% of the product. 10% of the product is the biodegradable cornstarch inner and 5% of the product is made up of the charcoal infused nylon bristles. Sustainable cardboard packaging.