Also called bamboo charcoal cylinder. It is round and symmetry. Its appearance is smooth, when knocking on it we can hear the metal sound. Outer diameter varies from 3cm to 20cm, the length can be cut according to customer抯 requirements. Bamboo charcoal tube has basic performance of bamboo charcoal.It can purify the air ,treat water. It is not only suitable for the house,office as healthcare decoration,but also can be used as burning fuel.