Bigsby licensed true vibrato. This unit is a die cast high quality alternative to the B7 model. The B70 model is used for thin acoustic and electric guitars such as Les Paul, ES-175 and ES-335. It comes complete with arm, a spring for the vibrato mechanism and 6 mounting screws - four to attach the unit to the side of the guitar and two to hold it down on the front. Fitting instructions are included although a local guitar luthier is recommended if you are unsure about carrying the work out yourself. It does not come with a bridge although you can order one separately. Made in Korea.