RIO's Micro Swivels are the perfect accessory for reducing line twist when casting large, wind resistant flies. Adding a swivel between the tapered section of your leader and the tippet allows the tippet and fly to spin without twisting the rest of your system, resulting in smooth, tangle-free casting all day long. Swivels are also useful in long indicator leaders used in stillwater. By adding a swivel, the angler can add weight and also create a stopper for a dropper leg and fly to rest on after a fish has taken the fly.