1,carbon black N220 2,rubber grade 3,free sample 4,good quality and competitive price 5, ... ,bias tire,sidewall rubber and other high quality rubber products.(2)N220 is suitable for each kind of rubber, It has ... .5-3.5Extension% ≥+10-10-10+10Map Modulus at 300%-2.5 +/-1.3-1.7 +/-1.3-1.7 +/-1 ...