Design Engineering 010475 Titanium Protect-A-Sleeve with LR Technology, 0.5" x 4' Titanium sleeves will protect wires, lines, and cables, or any application where extreme high heat is present Capable of withstanding temperatures up to 1800 degrees Fahrenheit direct heat and 2500 degrees Fahrenheit radiant heat 1/2-inch ID will fit larger spark plug wires and protect them from hot exhaust manifolds and headers Superior thermal protection for street vehicles or race engines Water and heat resistant, they are also ideal for Powersports - ATV/UTV, motorcycle, personal watercraft, snowmobiles, and marine use