RING - This ring has a traditional rounded band with a blue glow color marbled throughout the carbon fiber. The ring is offered in a durable matte finish. With the ring being made out of carbon fiber and composite materials this ensures a lightweight feel to the point of being almost unnoticeable. PROPRIETARY NASA TECHNOLOGY IN EVERY RING - Having decades of experience with carbon fiber and composites, we invented a unique process for NASA that we use in every Core Carbon Ring made. The process allows for a strong, lightweight, comfortable, and truly unique ring. GLOW - We use a Non-toxic strontium aluminate infused in our resin for the glow. Glow times vary depending on charge time and sunlight/UV exposure. When charged with a UV light for 5 to 10 seconds, the ring will glow strong for a couple of minutes then it will dim for one to four hours. It is necessary to be in a dark space to see the full glow effect. SIZING - All of our rings are made according to US Sizing and are a standard fit ring. Please keep in mind, the band width can effect how the ring will fit. The wider band widths will sit on the fattier part of the finger making it feel tighter. We recommend with a 9mm or 10mm band width you go up half size from what you normally wear. SATISFACTION GUARANTEE - We want you to be completely satisfied with your new ring. If you are not for any reason, please contact us. We will be happy to exchange until the ring is a perfect fit or it can be returned for a refund.