Thank you very much for viewing. This is an aftermarket product imported from overseas. This is a set of four "Gretsch Chrome Metal Knobs." These are heavy metal knobs featuring the Gretsch "G" and arrow design. Installation is done by tightening with a hex wrench. (Not compatible with 6.3mm solid shafts.) How about these for repairing or replacing the knobs on your guitar? Regarding the product, please bid only if you understand and accept no claims and no returns.