Two black phenolic plastic skirted knobs with white indicator lines, as found on vintage Jaguars, Mustang, Mustang Bass and other Fender Fine Electric Instruments. Fits most vintage and modern Jags. Allen set screw fixing to CTS standard 1/4" solid shaft pots. I measured 1.004" diameter at the bottom lip of the knobs. Brand New. Genuine Fender 0019455049. UPC 885978492169.