Jim Dunlop / ECB-124 OFFSET - 3 Types Three different heights of rubber feet. From left in the photo: 9mm x 2 6mm x 2 3mm x 2 Diameter: Approximately 9.3mm - 9.7mm (common) Fits Dunlop wah pedals, but also suitable for Budda and older VOX V847 models. Please secure with instant adhesive, etc. You can adjust the feel of the pedal when you step on it to turn the switch on by changing the height of the rubber feet. You can also change the tread width by changing the height of the rubber feet on the heel.