Sonoreboom 3/4'' Wire Heat Shield - High temperature spark plug wire heat shield is made of fiberglass interwoven. PERFECT FIT car&auto etc heat shield brake line cable. Help to cable, wire prevent vapor lock, protect spark plug wires from melting,and protect sensitive wire looms from close proximity heat,shielding brake lines and hose and stopping clutch cables from melting., Fireproof, Radiation Resistance - Wire plug wire protector operating temperature: - 418℉ - +1382℉. Withstands operating reflective temperature of 600℉continuous and 1500℉intermittent.Simply pull the wires inside ,AN hoses,cables etc.Capable of reducing up to 60 - 80 percentage of radiant heat., Save Cost, Protects wires from melting - Soft, flexible fuel line heat sleeve tight structure, sealing provide multiple protection for cables, wires. Protecting sensitive wire looms form close proximity heat,shielding brake lines and hose and stopping clutch cables from melting. Save cooling costs, better cover and protect cables, wires., Adjustable, Easy Use and Install - Sonoreboom hose heat sleeve is length adjustable, The car cable heat shield can be easily cut to the proper length for each spark plug boot/wires. PERFECT FIT cables, wires. heat shield car fiberglass hot rod sleeve helps to prevent vapor lock,It can expand and contract over fittings,cable,terminals and more., Various Lengths and Sizes: Our has 1/4", 5/16'', 1/2", 3/4'', 1'', 1-3/16'' of spark plug protector sleeve and variety length selection your need. (Tip: It is best to wear rubber gloves when installing. Tiny fiber fine hair will adhere to the skin, causing the skin to itch. be sure to use shrink sleeve or a few wraps of electrical tape on the ends to keep it from fraying.)