1.Multiple Size and Widely Use - Include many sizes heat shrink tubings for your home applications. Our heat shrink tubing are widely used in wire connection, rust prevention and corrosion protection of solder joints, protection and insulation processing of wire end, wiring harness and electronic components, and audio and electrical DIY. Works well for protecting headphones and phone cables and so on.2.Premium Quality and Long Lasting Protection: Our Heat Shrink Tubing has excellent flame retardant and insulation performance. Has the advantages of good tightness, acid and alkali resistance, durable and anti-aging. Shrink wrap wire tensile strength: 14 Mpa. Dielectric strength: >20kV\/mm. Elongation at break: >400%. Volume resistivity: >1.0 10^14.cm. Cold-resistant bending -22(-30 C) 1h without cracking.3.Easy Use and Fast - You just use a heat gun heat it evenly until it wrap the wire or connector tightly. Soft and flexible wire shrink wrap, low shrinkage temperature-minimum shrinkage temp: +158(+70C), fast shrinkage. Come with a plastic case for easy storage.4.Safe \u0026 ECO-Friendly - Our heat shrink tubing are UL certified, RoHS compliant, which ensures its safe and environmental protection. Protect you and your famaily from toxins.5.What You Get: - Total 650pcs black ratio 2:1 heat shrink tubings, 8 sizes. internal diameter, 1\/24\