Dear Seller,It is nice to write to you. This is Vinapono from Vietnam. I am interested in this style of cement clinker cement, grey clinker and in doing business with you.May I know more information about product such as:Strength Grade ( Mpa ) ,Color,Main Raw Material,What is the product-per-unit cost including shipping via Air Express to the Vietnam?Thanks for your response.Regard With ThanksVinaponoVinapono company limitedny Tin Nhn l t in thoi di ng Show More