Solid thick plastic constructed pedal with rubberised base and foot pedal. The jacks and gear system inside the pedal are plastic, however the action and throw of the pedal is still quite smooth.
I bought this as a cheap solution for needing a volume pedal for a one off gig, and for the cheap price it served me well, and I have continued to use it for various applications in the past. There is no apparent 'tone loss' in my pedal chain with this volume pedal, and my only criticism would be that the throw of the pedal is not as smooth as on more expensive pedals.
Would recommend for those on a budget, but not for constant use/gigging.