The yarn can be knit comfortably without rolling around. Rotates from either left or right (ball bearings) If you thread the yarn into it, you will not have to worry about the yarn rolling around around around the twine. It rotates from either the left or right side, eliminating the hassle of the yarn rolling when you knit. Made of wood and has a sturdy construction and non-slip bottom for peace of mind. *The shape has been carefully designed to prevent injuries and the tips are relatively rounded. Please be careful when using in environments with pets and children.