Specifications: The real gold and silver sewing thread.Prior gold and silver sewing thread has been used for embroidery,however,this METALLIC sewing thread is the strong thread with polyester core which can be used for final sewing or zigzag sewing.Why don't you sew up gorgeously by stitch,embroidery or decoration with gold and silver thread. Please do not use it for clothes which directly touch of our skin. *Caution.To prevent discoloration,please do not put sulfuric products(rubber products,stamp ink pad,crude oil micals).