These EVA foam line wheels are great for storing your leader or pre-rigging it ready to go so all you have to do is unwind the leader and connect it to your fly line. Because the wheel is made of EVA foam you can hook your fly anywhere on the wheel to hold it snug in place. You can also cut slits in the side walls to hook your line through to hold securely. Since they are inexpensive, I like to also write on the side of the foam wheel with a fine-point sharpie marker what the leader is so I can keep all my leaders straight.
The wheels are 3 inches wide and 11/16 inches thick making them perfect for all your leader types. The groove is deep enough to even fit the longest thickest leaders with ease.