2"x60YD Silver 11 mil thick premium grade duct tape with an aggressive calendered rubber adhesive. Choose 99-21 when high performance is needed to satisfy even the most demanding applications and industry requirements. This is a premium grade duct tape that offers extra strength and thickness for those discriminate duct tape users. Can use for sealing of pipes and ducts; fastening of construction films and plastic drapes; patching; sandblasting; overseas shipping; and other bundling, seaming, sealing, and repairing uses. (24 rls./cs.) IN STOCK. USUALLY SHIPS SAME DAY.