Bigsby B7 vintage tremolo for arched top guitars. The Bigsby B7 is a popular vibrato unit that is commonly found on electric guitars. It is designed to allow the player to bend the pitch of notes by moving the tremolo arm up and down, which changes the tension on the strings. The tremolo arm, also known as the whammy bar or vibrato arm, is the lever that is attached to the bridge of the guitar and is used to activate the vibrato unit. Overall, the Bigsby B7 is a popular choice for guitarists who want a vintage-style vibrato unit that can add a unique character to their playing. The tremolo unit comes with the strings installed and the bridge prepared. you can turn the lever backwards and you can press the tremolo arm (turn the double arrow) the tension spring and the strings are animated and follow your movement so you can animate close-ups well. the bridge can be moved in height and distance, the strings are tied to the bridge with hooks. the contact points to the tuning mechanics are pre-wound. I wish you a lot of fun with the kit and may your models succeed.