Coats Dual Duty XP General Purpose Thread 500yd - Black - This medium weight thread combines advanced technology from Coats with nearly 200 years of thread-making experience. Product is polyester-wrapped core-spun construction, creating a thread that provides enhanced seam appearance and makes sewing trouble-free. Smooth and strong, it sews perfectly on all machines, from vintage to today's most advanced. Length: 500yd (457.2m). 35 weight, 2 ply.