2 Sets Dual Concentric Stacked Control Knobs for Electric Bass Guitars Silver Color

Info:
Features:
Dual concentric stacked knobs, to achieve "Tone Volume Adjustment" on the same knobs.
Fit for electric guitars and bass.
Made of high quality alloy metal, providing long durability.
Package comes with 2 sets; there are 3 colors for option -- silver/ black/ gold.
100% Brand new and testing is fine.