The SX90R Black Nickel Model Professional Alto Saxophone has a 5-1/4" bell diameter, black nickel plated body with clear lacquer, gold lacquered keys, rolled tone holes, adjustable thumb rest, adjustable palm keys, extra F-arm with adjusting screw, G# pad cup lifting mechanism, stainless steel screws, mother-of-pearl key inlays without metal rim, waterproof leather pads with metal resonators, and a hydraulically formed neck.