Sharpstone Grinders are made from high-quality anodized aluminum. The raw materials and the metals used in manufacturing all Sharpstone Grinders are carefully selected and meticulously treated to ensure utmost quality. The aluminum materials are crafted from solid aircraft-grade rods, which are then fabricated using the latest CNC machining technology. This is why all Sharpstone Grinders come out polished and smooth. Sharpstone’s promise of quality emanates in every item that leaves the production line. Unlike other grinders that may have manufacturing defects, uneven edges, and other manufacturing imperfections, Sharpstone Grinders are crafted to exceed standards. Even minor flaws can cause injury to you and your hands should you slip and scrape yourself with these deformities while grinding.