Six replacement Push On Knobs For Marshall Amplifiers Very Dark Brown With Gold Face Push on type knob for split splined shaft pots. I was able to fit this knob to Genuine CTS 450G pots, '80s Marshall JCM800 Series pots and some recent Genuine Fender amp pots. Very dark brown almost black phenolic plastic knob features a gold top cap with black indicator line. I measured .770" diameter at the bottom, .616" overall height. The knobs on my '65 JTM 45 measure .542" diameter on the rim of the gold caps. Set of Six knobs, the pot is not included.