100% recyclable. Unique patent pending material contains 30x more air freshener than standard rimsticks, to gradually release fragrance over 30 days. Environmentally friendly air freshener will not dissolve in or pollute water. Low-VOC (compliant in all 50 States, as well as in Europe). Easy to use design fits most standard toilets. Clips on outside of bowl. Shrinks to fit as fragrance evaporates. Recyclable packaging. Non-hazardous for shipment. 12 per box.. . . .