The SideWinder has a very unique construction. This 9.6mm wide ring features a carbon filament wound exterior o top of a prepreg interior. Filament winding is a construction method used in light-weight driveshafts for the high end automotive market. Each ring is unique and made just for you. This ring is around 2m thick so it has a chunkier feel than our other rings. We offer rings in standard sizes 4.5-13.5 in whole and half sizes. We do not offer 1/4 sizes at this time. If you don't know your size please visit a your local jeweler and get sized. This only takes a few minutes and most jewelers are happy to help you even if you don't buy from them. Please do not guess on your size so that you can start wearing your new ring right away. This ring is made to order and usually takes 2-3 weeks to ship.