The Maxi-Lock Cone All Purpose Thread is ideal to use for all kinds of sewing projects. This highly durable thread is made of 100 percent polyester for the Serger and other regular sewing machines. It's designed to endure high speeds and tension in the sewing process. Each spool of this sewing thread will be a great addition to your sewing kit. Maxi-Lock has excellent seam strength, consistent sewability, mildew and UV light tolerant, and shrink and abrasion resistant.