Titanium Vulcan Lava Protector Sleeve Spark Plug Wire Boot 4cyl Protection of spark plug boots and wiresin excess of 2000F (1093.3 C) continuous and 3000F (1648.9 C) of radiant heat. Helps reduce misfires, Enhance Performance, Non-Flammable 25% stronger than fiberglass Boots, Fit is universal for most angled and straight boots Custom look of carbon fiber