Not only is the Niner Cogalicious RDO a beautifully crafted cog that's sure to please the most discerning of single speed aficionados, but it has the performance to match, thanks to its exceptionally hard 6AL4V titanium alloy. Translated to real world performance, you'll appreciate the enhanced chain and cog life exhibited by 6AL4V titanium. Further increasing longevity, the thick offset base evenly distributes pressure against the freehub body, also allowing for chain fine tuning with its slightly offset teeth. Note that this kit comes with alloy spacers and lockring, as well as a slick reusable Niner tin to match the cog's sleek and shiny appearance. It's available in 17, 18, 19, 20, 21, and 22 tooth variants.