The Cantech Industrial Grade Aluminum Foil Tape For HVAC Duct Sealing & Repairs is a heavy-duty 48-mm x 10-m tape coated with a very strong and stable adhesive. Ideal for sealing hot and cold air ducts, this aluminum foil tape excels at metal, automotive, and aluminum siding repairs. The tape's sturdy aluminum backing and tenacious adhesive ensure a secure and durable seal, making it an excellent choice for HVAC duct sealing and repairs as well as various automotive and construction applications.