Heng's 5650 3/16" X 1" X 20' Putty Tape
Heng's 3/16" X 1" X 20' Putty Tape is a heavy gray mastic, flexible putty tape. It is non-hardening and pliable. Used under moldings, around windows, doors and vents. Features waterproofs overlapping metal seams. Measures 3/16 inch thick x 20 inch long and is sold in quantity packs.