Machine Sewing: Works well with all home or commercial Serger or overlock machine, will not break at high speed machines. Perfect for Sewing, Quilting, Piecing, Serger and Overlock sewing. Our thread is made of 100% recycled polyester, it’s total eco-friendly thread, good for using on environmental friendly project. Our thread is a high quality product, its appearance is very smooth, no bulky appear on your fabric, color saturation is super high.\n\nBUYER PROTECTION GUARANTEED: We offer a 100% risk-free guarantee! Should our product fail to satisfy you, We will either replace the product or refund your money back. Any return should be unused and unpack onditions