Containing 50X more air freshening than standard rimsticks, the Eco Clip gradually releases air freshener over 30 days. 100% recyclable, doesn't dissolve when wet, or pollute the water. Discreet and secure. Complies with VOC requirements in all 50 states, North America and Europe. 100% recyclable. Shrinks to fit as fragrance evaporates. Works great on the outside of the toilet bowl, on the side of the tank or top of the partition.