Aeroflow Velcro hook and loop heat sleeve is perfect for protecting premade lines and hoses in a hot engine bay such as fuel lines, brake lines, vacuum hoses, wiring. This sleeve uses a Velcro strap for installation, so it can be installed and removed without the need to uninstall components and lines. This aluminium sleeve is made from a heavy reflective aluminium outer layer finished in black with a heat proof fiberglass inner fabric. It can withstand temps up to 650C. The foil finish reflects 95% of radiant heat and the inner layer of fiberglass provides insulation to the cable, hose or wiring inside.