Since 1925, Keilwerth has concerned itself with creating saxophones that allow the musician to shape his own sound and style. With this in mind, Keilwerth took the technical advantages and improvements of the SX 90, and added some extra features to truly make the musician's instrument his own. The result was the SX90R (the R standing for tone hole rings), a saxophone reminiscent of the old Conn and Buescher saxophones of the 1940s.

The SX90R Black Nickel saxophones have set the standards for quality and performance. The Black Nickel plated body is complemented with gold lacquered keys and meticulous hand engraving to offer a look and sound that cannot be duplicated by any other. The tone is warm and expressive and resonates full and clear, allowing each player to create a personal identity and voice.