1Polyester Thread: These red sewing polyester threads are sturdy and durable, not easy to fade, wear and break, and can be used for a long time. 2Widely Used: These yellow sewing polyester threads are perfect for all levels of quilting and sewing projects from beginners to professionals. 3Compatibility: Serger Thread is compatible with manual or machine sewing, providing more convenience and allowing you to sew easily. 4Ideal Gifts: These brightly colored red sewing threads are ideal and practical gifts for friends and family to make your life easier. 5Scope of Application: Sewing thread is suitable for daily quilting, edging, splicing, machine stitching, repairing shoes, coats, khakis, carpets or area carpets, etc.