Continental Grand Prix 4000 S Reflex II Black Chili Rubber/Reflex Stripe Updated Black Chili tread compound with carbon nano particles delivers 26% lower rolling resistance, 30% more grip and 5% longer mileage, plus it's self-cleaning Vectran Breaker belt is lighter and tougher than aramid belts, 5x stronger than steel and resists water, punctures and cuts Tread wear indicators help you gauge the true life of the tire, eliminating premature replacement or overuse 3-ply casing and 330 TPI provide additional reinforcement. Vectran Breaker belt is lighter and tougher than aramid belts, 5x stronger than steel and resists water, punctures and cuts