Ring cores are the metal sleeve that forms the inside of a handmade ring — the foundation everything else gets built on. We stock ring cores in stainless steel, titanium, damascus, copper, brass, and tungsten carbide, in widths and inside diameters to fit standard ring sizes. The core you choose sets the durability, weight, and metal-tone of the finished ring; the material you turn around it (wood, resin, antler, inlay) is where the artistry lives.