This is the ring for cyclists. The material is aerospace grade titanium 6AI4V, which is very lightweight, durable, and hypoallergenic. The design includes a water bottle, tire print, a titanium cog, chain-ring, and bottom bracket of my own design. The cogs have seen use all over the world, been featured in the Museum of Modern Art, and have earned a design patent.
The best way to determine your ring size is to measure the inside diameter of a ring that fits you well. This can be easily done with a set of digital or dial calipers. Once you have that measurement, refer to the chart on this product listing to determine the proper size to order.