The street fire spark plug wires feature a low resistance conductor that's wrapped in a sleek and durable black sleeve. The terminals are covered in black boots that protect the conductor from engine heat to ensure spark delivery. Helically wound conductor suppresses electro and radio noise Kevlar core combination for great strength and durability Heavy duty terminals for secure connection and silicone boots protect against high exhaust temps 8 mm silicone and synthetic jacket resists heat and abrasion 500 ohms per foot resistance for improved spark delivery and power