This item is an electric yarn winder,you can now wind your yarn without your hands and its fast ,reliable and durable. With unique guiding arm feature, this wind can wind a neat and tidy yarn ball ,strong metal parts will let it hold a yarn cake up to 20 oz. WIth adjustable tensioner, you can keep the constant tension with your hand, now fingers burning anymore ,and a perfect cake is a easy thing to do. Comes with a speed regulating motor,you can keep the machine run at the right speed at beginning, and slow the spped down when the yarn ball getting bigger.