Grover/Trophy Musical Products was founded in 1922 as a wholesaler of musical instruments and accessories under the name Grossman Music Corporation. We began manufacturing in the 1940s and eventually exited the wholesale business entirely to concentrate on manufacturing. We are best known for our full range of Grover® guitar tuning keys, including the popular ROTOMATIC® series for guitars along with tuning keys for basses, mandolins, banjos and ukuleles; as well as bridges, cables, the Ultra CapoTM and other fretted string instrument accessories