Maxi-Lock is one of the best selling serger threads on the market. Not only is it considered to be one of the best quality threads available, it's also affordably priced. Maxi-Lock threads are as color fast and durable as thread used by the world's leading clothing manufactures. Ideal for virtually any fabric, Maxi-Lock is available in over 70 colors and is 100% polyester. For a pop of interest, try Maxi-Lock "Swirls", a line of variegated thread, or "Soft as Yarn" for quality nylon thread.