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3M 7000001904 is a 2-inch x 10-foot roll of aluminum foil tape. The tape is designed for sealing and patching of seams and joints in many materials such as masonry, metal, insulation, and fabrics. It has excellent adhesion to a variety of surfaces, including painted metals, vinyl, and plywood. Its aluminum body provides a durable, opaque barrier to effectively prevent moisture, vapor, and dust infiltration. Its malleable application makes it perfect for patching and repairing air ducts, dryer vents, and metal roofs. The tape is also resistant to flames, water, and chemicals, making it a great choice for outdoor projects.