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) :
Blizzard - Wrapped Up - Red - Fabric — The Mountain Thread Company (TM)
Amazon.com: Threadart Heavy Duty Bonded Nylon Thread - 1650 yards (1500m) - Coated No Unravel - #69 T70 Size 210D/3 - For Upholstery, Leather, Vinyl, Weaving Hair, Denim, and Other Heavy Fabric - Beige
CARDINAL RED - Sunguard Thread B 92 4oz. Cardinal (207Q) | Marine - Automotive Upholstery Thread - Fabric Warehouse
Red Bonded Nylon Upholstery Thread Size 207, Tex 210, 16 Oz. 1900 Yards | eBay
Extra Strong Upholstery Thread For Machine And Hand Sewing Indoor Or Outdoor Use, Multi Purpose - Sewing Threads - AliExpress
Coats & Clark Extra Strong Upholstery Thread (150 Yards) | Yarnspirations