Chrome plated steel. Best currently available ferrules for American Series Teles. The bottom portion of this ferrule fits into a 5/16" hole. The upper 'stepped' portion fits to a 3/8" hole. You can mount these flush to the back of the body '50s style or with the upper portion 'above the deck' '70s style. Brand New. Genuine Fender 0994817000. UPC 717669507213. Photo may not reflect current Fender packaging.