Amazon.com: All Purpose Extra Strong Heavy Duty Bonded Black Sewing Thread Great for Quilting,Upholstery, Leather, Denim, Marine, Outdoor and Camping Products. T70#69 210D/3PLY 1400 Yards. : Arts, Crafts & Sewing
Nylon Hand Sewing Thread Heavy #18 – Rochford Supply
Extra Strong Upholstery Repair Sewing Thread Kit and Heavy Duty Household Hand Needles - Etsy
Professional Heavy Duty Hand Sewing Thread | Viper Professional
Industrial Thread - 69 Nylon Spools - Black & White
Amazon.com: Heavy Duty 100% Organic Cotton TEX 70 Sewing Thread - 300 Meter Spool - Natural
Heavy Duty Spool Sewing Thread for Bags Stitcher Closer 3600 ft (6 Rolls) | eBay