The product “appears” to be a banjo tuner specifically designed for a 5th string banjo. It is possibly manufactured by Saga or Gotoh, two well-known brands in the musical instrument industry. The tuner features a planetary gear system, ideal for precise and easy tuning of the banjo strings. This accessory is essential for musicians looking to keep their banjo in perfect pitch for an optimal playing experience. *** I am not an expert please see photos for details **