The 3020n ABM tailpiece is a top-quality component machined from a truly solid billet of ‘bell’ brass and plated in nickel to give the famous vintage Gibson appearance.
This ABM was fitted to a Gibson USA Les Paul Standard which was factory equipped with a heavily chrome-plated zinc tailpiece. The new bridge instantly improved the timbre of the guitar, emphasising further middle and treble frequencies compared to the darker, more bass-focussed response of the original. The guitar now cuts through a mix much more clearly.
I highly recommend this ABM component as a great example of German engineering, and looks much like an original 1950s Les Paul component.