The Stringliner LevelWiz reels feature patented handles that are reloadable, allowing you to replace rolls of twine as needed. Simply grasp the top and bottom "shoulders" of the reel handle and pull apart. Slide a new roll onto the spindle and push the two pieces of the handle back together. The handles also allow the roll of twine to spin freely, releasing the line without twisting or knotting. The LevelWiz reels also feature precision line levels that store right on the handles!