Set of 4 brown knobs with white numbers. Push on type mounting for standard "D" shaped pot shaft. Diameter measured at the bottom of the skirt is .895". As found on some modern Fender amps. Used on Acoustasonic™ Series amplifiers manufactured from 1998-2004. Brand New. Genuine Fender 0051018000. UPC 717669106508. Photo may not reflect current Fender packaging. These knobs are dark brown, they are not black, they are brown. Before you order I suggest that you contact Fender Customer Service to confirm that these knobs will fit your specific amplifier. There are a number of different Acoustasonics out there and some use different Fender Part Numbers depending, it seems, on exactly which pots they are going on. You may also find the data sheet and parts list for your specific amp on Fender's website.