The Street Fire Spark Plug Wires feature a low resistance conductor that's wrapped in a sleek and durable black sleeve. Features: Helically wound conductor suppresses electro and radio noise Kevlar core combination for great strength and durability Heavy duty terminals for secure connection 8mm silicone and synthetic jacket resists heat and abrasion 500 Ohms per foot resistance for improved spark delivery and power Silicone boots protect against high exhaust temps