958 Silver is a unique silver alloy that consists of 95.8% pure silver. The increased density from sterling silver results in a darker sound with a remarkable array of tonal colors. Miyazawa 958 silver deepens the resonance in the sound without increasing the thickness of the wall. Available in two tubing thicknesses: standard tubing (.38 or .015") offers a flexible and resonant sound while heavy-wall tubing (.45 or .018") provides an even darker sound.