New Description
Keys that are compatible with KeyboardMania series arcade games. These tend to come out of the Yamaha PSR series as well as the CS1X and CX2X series. Syntaur has a list of all PSR models and their respective key sets [https://syntaur.com/yamaha_psr.html here]. If you hover over a model, it should link to the K59U set. In that manner, instead of buying replacement keys from a site, you can track down a Yamaha keyboard and use it for parts. Each KBM keyboard houses two full octaves, without the separate Middle-C key.
Old Description
Keys that are compatible with KeyboardMania series arcade games. These tend to come out of the Yamaha PSR series as well as the CS1X and CX2X series. Syntaur has a list of all PSR models and their respective key sets [https://syntaur.com/yamaha_psr.html here]. If you hover over a model, it should link to the K59U set. In that manner, instead of buying replacement keys from a site, you can track down a Yamaha keyboard and use it for parts.