sup { vertical-align: super; font-size: smaller;} Water and Weather Resistant Adhesive Back Closed Cell Sponge Rubber Seal is a great seal for many applications; by combining high quality rubber extrusions with 3M high-powered heat-bond tape, it offers a nearly unbreakable bond and creates a similar surface bond when applied correctly. Color: Black Material: Closed Cell Sponge Rubber (Density: .544 g/cm 3 ) Length: 5 Ft.