This is a high quality potentiometer. This ships with all of our drivers.
Most drivers don't dim linearly, this can be offset by using this audio-taper potentiometer, which results in linear dimming. This means turning the knob half way will result in approximately 50% power of your LEDs when used with a Steve's LEDs driver.
Potentiometers are relatively sensitive devices, and a having a replacement on hand is definitely worth the investment.