Spun polyester threads are made by spinning together lengths of polyester staple into single bundles called plies. Two or more plies are then twisted together to produce a thread of the desired size. Many different finishes (such as hot wax,silicone, and silicone-free) may be applied to spun polyester thread to enhance the sewing performance for specific applications. Spun polyester threads provide superior strength and are resistant to sunlight and abrasion when compared to cotton threads of equal size. Spun polyester can be used on apparel as sheer as lingerie or as heavy as denim. Dunhuang brand sewing thread is Dunhuang premium spun polyester sewing thread. An advanced low-friction lubricant and uniform construction provide exceptional sewing performance in high-speed and critical sewing operations. Features: 100% Polyester -- Resistant to sunlight and chemical degradation Superior lubricant -- Resists needle heat; minimizes skipped stitches Uniform construction -- Lower defect levels for uninterrupted sewing Extensive color lines in stock -- Immediate availability Companion Astra bobbins -- Available to match top