Ty-D-Bol Over The Rim Gel is specially formulated with high performing surfactants (a substance that tends to reduce the surface tension of a liquid in which it is dissolved) to clean the toilet bowl while helping to prevent future build up. Freshens with scent that is released with every flush. Convenient, simply peel away foil seal and hang on rim of toilet bowl. Long lasting, lasts for up to 4 weeks. Safe for septic. Size: 2 Ct. Type: Gel Life of Product: 4 Weeks Fragrance: Spring Clean