Amazon.com: COATS & CLARK Extra Strong Upholstery Thread, 150-Yard, Black (S964-0900)
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Amazon.com: 6 Rolls Strong Upholstery Thread High Strength Sewing Waxed Thread with Hand Stitching Needle Set for Denim Leather Craft DIY Machine (Black, White, Red, Dark Blue, Dark Green, Brown, 0.55 mm) :
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Amazon.com : Extra Strong Upholstery Repair Sewing Thread Kit Coats and Clark - Heavy Duty Curved Needles, 1 Black Spool, 1 Brown Spool : Arts, Crafts & Sewing