Heng’s 3/sixteen” X 1-half” X 20′ Putty Tape Extruded Tape is a heavy grey mastic, versatile putty tape. It’s non-hardening and pliable. Used below moldings, around windows, doors and vents. Options waterproofs overlapping steel seams. Measures 3/sixteen inch thick x 20 inch long and is offered in amount packs.