Best choices for sewing bags such as :Flour bags, fertilizer bags, food bags, cement bags etc. Our threads can be used on NEWLONG, UNION-SPECIAL ,FISCHBEIN high speed sewing machines, proved very good. Feature: 100% polyester virgin threads, enough Strength, enough Length, without knots etc. Ne10/3 12/4 12/5 20/6 etc. You will not regret to do business with us.