The handle is made of bamboo, which is the fastest growing woody plant in the world. Bamboo is also anti-bacterial and water resistant which makes it both a sustainable and practical choiceThe hair of the brush is made of Coir - or coconut fibre - which is a rough material made from coconut shells. The material is obtained from mature coconuts, which gives it the natural brown colour. Coconuts are an abundant, renewable natural resource and Coir is sustainable due to this, its strength and low decomposition rate. Bamboo Wood Mature Coconut Fibre Hair Measurements: 15 x 7 cm