FeaturesPackage of four black skirted 1-10 knobs with silver discPush-on mountingFits standard "D" shaft potentiometers (with flat portion of "D" shaft facing 12 p'clock position when potentiometer is turned down to minimal level)7/8" diameterFits Cyber-Champ®, Princeton 65/65 DSP/650, Acoustasonic™ Jr., Super Bassman® (2012) and Super-Champ® XD amplifiers (1999-present)