Using simple chemical-free materials, the Chikuno Cubes ($28) neutralize odors and purfy the air with its unique surface design. These gorgeous cubes are made of ultra fine bamboo charcoal and clay minerals that absorbs moisture, gas, ethylene, ammonia, formaldehyde and more. Their micro-honeycomb structure is designed to amplify the capacity of absorbing and combating unpleasant or lingering odors perfect for refrigerators, closets and cars. [source]