Coats: Thread & Zippers S910-5020 Dual Duty XP General Purpose Thread, 250-Yard, Aqua Marine This 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