Binchotan charcoal is regarded as the purest and most effective type of activated charcoal and is revered for its purifying ability. These sticks are 100% Ubame Oak, crafted in high-temperature ancient kilns. When added to water, the thousands of microscopic cavities left in the wood remove unwanted toxins and impurities, while softening and improving taste. Completely natural, the sticks are great for the garden and can be disposed of in soil once they start to diminish in efficacy (about three months). Made in Japan.