Rogan 1/4 Inch D-Shaft Pointer Knobs. Style # G-11, Gamma Series Round Control Knob. They are ABS Black with a White pointer. There are some different numbers stamped inside (#3 in the Pic), but they are all the same size, shape, and color. They are New Old Stock.

Specifications:

.69 in /17.53 mm Height

.72 in / 18.29 mm Outside Diameter

1/4 in / 6.35 mm D-Shaft