Complements urinal and bowl para blocks. Fragrance fights odors up to 60 days. Pure paradichlorobenzene; individually wrapped. Each block includes cardboard box for hanging. Scent: Cherry; Physical Form: Solid; Application: Odor Control. ~ Includes six wall-mountable para block air deodorizer.KRYW24. W24. Krystal 24 oz. Block Cherry Wall Blocks.