This is a set of GOTOH guitar saddles and bridge, models 510FA and 510FB, in Gold. I had these on hand as spare parts, but they turned out to be incompatible with my old guitar (current 510FA/FB specifications). They have been opened once, but are otherwise new and unused. These are stud-lock type parts, which make string changes and adjustments easier, and efficiently transmit vibrations to the body, positively impacting sustain.