They are mini4wd cars in 1:32 scale that reproduce rc buggy in 1:10 scale of that time. So full Kyosho and Tokyo Marui buggy has been reproduced like Rocky, optima, turbo optima mid, samurai, and many more.
I own the Kyosho Rocky and Shadow 4WD. This last models come with special tuned engine for high speed. The particulary of Marui mini4wd is that you can choice the speed of car and change the trasmission from 2wd to 4wd by switch
