This design consists of two parts. One is the line reel at the end. Many people don't want to remove the hook after fishing, and some have a sinker in the middle of the line. Reeling in the line at the end prevents the hook from getting in the way and the line from getting tangled. Alternatively, you can pre-wrap the leader and hook on the reel for quick leader changes without tangling. I printed 11 reels, prepared 11 leader hooks, and a rod clip for combining with the reel.