Heng's Putty Caulk Sealant is a heavy, flexible, non-hardening butyl material that remains pliable as packaged. Specifications•Used To: Seal Under Moldings/ Around Windows/ Doors/ Vents And Waterproof Overlapping Metals Or Rubber Roof•Caulk Type: Putty Tape•Color: Gray•Unit Size: 30 Feet•Unit Type: Roll Releases Easily From Its Silicone-Treated Backer For Use Under Moldings, Around Windows, Doors & Vents Can Be Used To Seal & Waterproof Overlapping Metals & Easily Shaped & Formed To Seal Difficult Areas | Heng's Putty Caulk Sealant, 30' Roll, Grey