Product DescriptionUltra Dee Polyester Thread is a corded thread made from a high-strength, resilient, and continuous filament polyester and treated with a special finish to prevent unraveling. Dependable quality control of size and finish assures trouble-free sewing of cotton or synthetic fabrics. Heat set to minimize shrinkage or stretch with a bonded finish that adds strength and reduces fraying at the needle eye. 1,035 yds. per spool.