Chikuno Cube is an air freshener made from ultra fine powder of activated bamboo charcoal and clay minerals.  The activated bamboo charcoal (activated carbon) is a form of carbon that has been processed at high temperature level to make it extremely porous to create a large surface area. Which mean where looks smooth & solid in chikuno cube also has invisible numerous holes. They are excellent at absorbing and trapping harmful substances from the air such as allergens, smoke, odors etc. Chikuno Cube works best in a small enclosed space such as refrigerator & closets.  It is eco-friendly and can be re-used for up to 1 year by just exposing it to direct sunlight every month for 6 hours.  The quality is rooted in Kyoto’s craftsmanship, and it won the Japanese Good Design Award in 2008.