Tippet rings are small, lightweight, and pass easily through rod guides. They allow you to prolong leader and tippet life as the material isn't consumed by tying knots. simply tie in place using a clinch or improved clinch knot.
You can also attach separate droppers directly to a tippet ring when using multiple flies.
Always tie your leader or tippet onto the tippet ring prior to removing from the snap swivel.