We are one of the biggest carbon black exporter in North China.offer all kinds of carbon black such as N220,N330,N550,N660,N234,N326,N339.N375,N774 etc.We can ensure quanlity of our products,with a competitive price.If you are interested ,please contact to me,i will send you specification of which size you need We can communicate better by e-mail if you are interested: