Brand new, out of production, JHS 4 Wheeler Bass Fuzz. Description from JHS:

Bass fuzz has to be the sweetest thing ever. There is nothing like a tight bass line with fuzz driving it home. Our 4 Wheeler V2 will give you the ability to do everything from 60ﾒs jam band to modern electronic fuzz. With Volume, Tone, Fuzz and a specially tuned Gate control, the ability to tweak away is at your fingertips. There is enough volume/headroom to shake any stage, as well as drive your amp as hard as you would ever need. The tone and fuzz controls are super flexible with usable sweeps all the way around, while the gate control can give you those much desired synth break-offs or just the right amount of jab for that perfect riff. The "Hi/Lo" toggle switch lets you go from a deeper, more low-end focused range of tones to the normal V1 settings.

Bass players are raving about it and guitar players even seem to love what it does to their tone, so this may be the fuzz to fit the bill...

This pedal requires standard 9V DC Negative power and measures 2.2"x4.3"x1.5"