The effortless Norvise Automatic Fly Tying Bobbin is a true marvel that will “automatically” rewinds itself, making thread management simple, quick and efficient. This bobbin automatically retracts instantly to the correct tying position, yet remains suspended from the hook where released.The bobbin works perfectly with the Norvise Fly Tying Vise and Vise Thread Post that comes with the vise. The Norvise Bobbin is the perfect thread-management tool. Whether you are using a Norvise, or any other vise, this bobbin will improve, simplify, and speed up your fly tying.