For the colored GP 4000 tires, the activated silica compound improves the handling at stability limits and gives great rolling resistance. The anti-tear formula in the rubber compound prevents tread brittleness while increasing mileage performance. The extra special thing about the GP 4000 is their puncture protection made from Vectran liquid crystal fibres. The patented Vectran Breaker reconciles the conflicting goals of low weight, low rolling resistance and top puncture and cut resistance in a fascinating manner. Made in Germany.