Size: 210d/3 Extra Strong Nylon Thread for Sewing, 1500 Yards Upholstery Thread, Total Length: 6000 Yards, Heavy Duty and High Tensile Strength, Unbreakable By Bare Hands. Nylon Thread: 210d/3 Nylon Upholstery Thread Heavy Duty Thread is Extra Strong 3 Strands Thread, Tough and Durable, and Won't Break Easily. Great for Both Indoor and Outdoor Use Especially for Sewing Leather, Denim, Canvas, Etc. Hair Thread: Nylon Thread Use for Hair Weaving and Extensions, Hair Weft, Wig Hair, Hair Weave Extension, and So On Hello, We are A Company Specializing in Textiles (Various Fabrics, Threads, Etc.).