Groove Life Groove Belt Men's Stretch Nylon Belt with Magnetic Aluminum Buckle, Lifetime Coverage Carbon fiber/black New without tags, never used The new Carbon Fiber Groove Belt™. Five times stronger than steel, Carbon Fiber has become the go-to material for the diehard everyday carry (EDC) person. Everything from high-performance cars to kevlar to guns are now made with Carbon Fiber. The perfect addition to your tactical gear.