dear sir: we are one of leading manufactures specializing in bias tyre/radial tyre for truck. we have gained the iso9001, iso9002 quality system certificate. we have gained the ccc, e-mark & dot certificates. our products enjoy high reputation at home and abroad. should you be interested in our products, please feel free to contact me. we look forward to your kind enquiry. best regards david yang e-mail: davidyang1107@hotmail.com