The Vertebrae weave, made using strong and beautiful bronze. Along with stainless steel, bronze is one of the hardest of the heavy metals I work with. The price is therefore slightly higher than the same thing in aluminum, brass, or copper. But the bracelet is more durable as well. There is a good reason a Bronze Age existed in our history! Bronze is a copper-tin alloy, and because of this, it will oxidize over time like a penny and become darker. Some people enjoy this feature of the metal, but it can also be cleaned to bring bring back its shine. This braclet is held closed with a simple bronze-colored lobster clasp.