Kohkento Kohsen Therapy Carbon 3001 and 4008 Set - 10 pieces each, 1 box each. This set includes 1 box of 10 pieces of 3001 carbon and 1 box of 10 pieces of 4008 carbon, for a total of 2 boxes. For light therapy, two carbons are used as a set. The tips of these carbon electrodes are arc-discharged, causing them to burn at high temperatures and emit a solitary light. This provides continuous spectrum visible comprehensive light and radiant heat, which are similar to sunlight, and are necessary for treatment. The carbon for the therapy device is mainly made of high-purity carbon, and the carbon for the therapy device is a cored electrode containing a trace amount of metal elements in the core, and the emission spectrum is changed by its composition.