Black, Knurled, Small Knob
Used as:
Mark V - Channel Select and Effects Loop Assign knobs
Mini Rectifier 25 - Alternate to Chrome Knurled Knobs for Rotary Controls
Road King I - Reverb, FX Send, FX Mix & Slave Out knobs
Road King II - FX Send, FX Mix, Slave Out knobs
Roadster - FX Send, FX Mix, Slave Out knobs
Three Channel Non-Multi-Watt Dual & Triple Rectifiers - FX Send & FX Mix Knobs
Formula Preamp - Rotary Control Knobs (except Output)