I replaced the stock Gibson Tailpiece and studs with the ABM.
The materials for the stock Gibson (Ping Works) are: Zinc Tailpiece, Brass Studs and Steel Bushings (I did not replaced those).
I did an A/B comparisson after recording the ABM (Tailpiece and Studs with stock Bushings) and the Gibson both with fresh strings.
The ABM parts gave a broader frequency spectrum. The guitar now sounds more "alive" as a result of the accenuated highs and lows. The tone with the Gibson parts in comparisson sounds tighter, more mid focused as the bass and treble frequencies don't stand out. Having a guitar with prominent high-mids the ABM balanced the tone very nice by extending the high frequencies while with the Gibson parts the high-mids were too much for me.