7 mm black silicone with synthetic jacketing resists heat, oil and abrasion. A combination Kevlar helically, spiral-wound core at 350 ohm per foot resistance delivers greater spark energy, while improving power, idle and fuel efficiency. Matching black silicone boots protect against high exhaust temperatures. Double, spring-locking terminals for secure vibration-proof connections. Cloth jacket is rated at 450 f. These wires will work on all Harley-Davidson models with point or electronic ignitions. Custom fit and universal sets available. Universal sets available with black plug boots or rajah terminals. Colors: Orange with Black Tracer, Yellow with Black and Red Tracer, Black with Blue Tracer, Red with Black Tracer, and Gray with Brown Tracer. Lifetime manufacturers warranty. Made in USa.