This lockring weighs only 8 grams! Replace your existing bike cassette lock ring and your setup will be even cooler than it already is. Many standard cassettes come with heavy steel lock rings, and while they certainly work well, they're very heavy compared to this Ti lock ring. Even if you have already have an aluminum lock ring, this Ti lock ring will make an awesome upgrade.
This particular lock ring is sized for use when your cassette's smallest cog is 12 tooth. It's slightly larger than the 11 tooth version.