The studs don't last very long, they rip off very easily and these tires quickly become slick road tires. They work great afterwards as road tires, but off road they aren't too good. I had them running only for a half hour session before pretty much all the studs ripped off on loose gravel surface. The rims are pretty good quality, look great on my Tamiya TB-02 Buggy. Nicely pre-glued with foam. I would recommend these for pure sand/grass where there is no contact with anything remotely solid. Once they wear out, use them as road tires as they do work well on pavement. I will stick with Tamiya Super Grippers for a true off road tire.