Big D PREMIER RESTROOM PRODUCTS are made from a specially engineered copolymer impregnated with a powerful organic odor-counteracting compound. They are available in the seven enticing Big D Premier Scents — fragrances that match and compliment each other. THE D-CLIP RIM HANGER contains deodorizers that are remarkably more powerful than traditional rim hangers, and no batteries are needed. THE D-CLIP is specially designed to be installed with the body of the rim hanger on the outside of the toilet. VOC compliant in all 50 states, it will keep the area smelling fresh for 30 to 45 days.