This Alpha Dual-Gang 50K Linear potentiometer is a two-in-one potentiometer stack, for independent stereo control. It's an audio/log taper 50K potentiometer on each half, with one shared knob for both. It's smooth and easy to turn, but not so loose that it will shift on its own. We like this one because the legs are 0.2" apart with pin-points, so you can plug it into a perfboard.