Double Wall Adhesive Heat Shrink Tubes Assortment Adhesive lining provides an environmental seal to prevent moisture, dirt and chemicals from affecting electrical connections. Excellent for automotive, marine, heavy duty, industrial, construction and home applications. All tubes have a 3:1 shrink ratio and are weatherproof. 60 black and red pieces in 5 sizes. Forms a secure bond over smooth and irregular shapes. Excellent for insulation, strain relief, abrasion shielding and corrosion protection. Easily shrinks with our Cat. No. 87250 or equivalent Heat or other heat source. Shrink tubes made of polyolefin material 23210