Nylon 6 yarn FDY -- SD,BRT xD/yF we can make variable types of xD/yF according to your Specific requirements. Nylon 6 ... ,BRT,TRILOBAL-- xD/yFwe can make variable types of xD/yF according to your Specific requirements. We are one of the ... Specific requirements. Nylon 6 yarn FDY -- SD,BRT,TRILOBAL- xD/yF