12-color polyester sewing thread set, with thread guide. It came with a sewing machine I purchased, but it's unused. It seems you put the spools in the box, stand the thread guide rod in the box, and connect it to the sewing machine's thread guide. I bought it over 20 years ago, so it's unused, but the box has dirt, scratches, and dents. - Thread Type: Polyester - Color Assortment: 12 colors - Packaging: Boxed