DUAL DUTY XP 457M-500YD BUFF General Purpose Dual Duty XP thread is a medium weight thread sized for most hand and machine sewing. It can be used on all fibers, knits and wovens. Dual Duty XP is a strong, smooth thread for consistent tension and excellent stitch formation. New trap spool holds the thread neatly and securely. A value put up of our bestselling colors.