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 affect 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. We also offer free exchanges until you have the perfect fit! Proprietary Nasa Technology in Each 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 an extremely strong, lightweight, comfortable, and truly unique ring. Handcrafted on the Space Coast of Florida - Each ring is professionally and individually handcrafted giving you a one of a kind piece. 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 refund you for your order. Handcrafted in the USA with a Lifetime Warranty This ring has a contemporary flat texalium silver band with black carbon fiber interior in a matte finish. The matte finish is extremely durable and scratch resistant. The ring is made with a silver texalium exterior and aerospace grade carbon fiber for the interior. The ring is durable, waterproof, chemically resistant, hypoallergenic and perfect for everyday use. All of our rings are handcrafted in the USA with a Lifetime Warranty.