DNA SPBK-TT-WH-X8 White Spark Plug Wire Sleeve Cover Boot (Pack of 8) Withstands temperatures up to 1,200F continuous and 2,000F intermittent use No-fray cuff with a flexible dual-wall high-temperature basalt sleeving Works as a radiant heat barrier or can be placed directly on heat source Universal design fits most boots Length: 6", Thickness: 0.05", Inner diameter: 0.75"