Create personalized sewing projects with the Coats & Clark Transparent Polyester Thread 400 Yds. Specially designed for invisible seam stitching, these 400-yard threads are made of polyester and can be used on overlock or conventional machines easily. The high-strength and low-stretch feature of these transparent polyester threads makes them ideal to use for machine quilting, home decorating projects, appliques and crafts. They come on trap spools for tidy storage.