Years in the making these are exact copies of the original WH10V1 potentiometer. Samples of original WH10V1 pots were analyzed and likely destroyed to obtain these replacement pots. These will work in all variations of the WH10 wah as well as the Funk Factory and Ten Spot II. Newer versions of the WH10 may require a little more work when replacing with these. These are high quality carbon potentiometers with that funky, wet honk that the original V1 is known for.