2"x60YD Shurflex (TM) HVAC Metalized Backing duct tape designed for air tight and moisture-free sealing. Used for seaming and joining aluminum-backed flex ducts and sealing metal ducts. Tested in accordance with UL723. 10 mils thick with a natural rubber adhesive. (24 rolls per case) 1 case minimum order. Price is for 24 rolls @ $15.70/rl. Non-stock item. Please allow 1-2 weeks lead time.