Sizing - Our rings follow US Sizing standards and are designed for a standard fit. Keep in mind that the band width can impact the fit. Wider bands sit on a fleshier part of your finger, giving a snug feel. For 9mm or 10mm band widths, we recommend choosing half a size larger than your usual. Don't fret about getting the perfect fit right away - we offer free exchanges until it feels just right! Proprietary Nasa Technology in Each Ring - With years of expertise in carbon fiber and composites, we developed a unique process for NASA that we now apply to each Core Carbon Ring. This method results in a ring that's not just incredibly strong and lightweight, but also comfortable and distinctively unique. Handcrafted in the United States - Each ring is professionally and individually handcrafted giving you a one of a kind piece on the Space Coast of Florida. Satisfaction Guarantee - We're committed to your complete satisfaction. If your new ring doesn't meet your expectations, don't hesitate to get in touch. We offer complimentary exchanges to ensure a perfect fit. And if you're still not satisfied, you're welcome to return the ring for a refund. Crafted meticulously by hand right here in the USA, all of our rings come with an unbeatable Lifetime Warranty! Trust in our quality and service, as we stand by our products, always. Presenting a ring with a sleek, flat black band and a matte finish, this ring is not only tough against scratches but also impressively lightweight. This ring is crafted entirely from aerospace-grade, unidirectional carbon fiber - a material known for its strength and lightness. It's extremely durable, waterproof, resistant to chemicals, hypoallergenic, and designed for daily wear. Handcrafted in the USA, our rings come with a Lifetime Warranty, testifying to their exceptional quality.