The Forza can be used on most soprano, alto and tenor saxophones that have a detachable metal or plastic hook. This includes instruments made by Selmer Paris, Selmer USA, Buffet Crampon, B&S, Cannonball, Keilwerth, KHS/Jupiter, and Yamaha 30 series and higher, and many Asian brands, etc.. The Forza can be used on the baritone sax as well but is only advisable when the musician has relatively large hands. A manual is provided with instructions on how to use and mount the thumb rests on your instrument. - the manufacturer