Most nitro cars come in "RTR" (Ready To Run) form these days, Which will generally include the pre-built model, With radio gear and engine (usually) pre-installed. But will not include batteries to power the radio gear, Suitable Nitro Fuel and starting equipment. Models that come in kit form will generally just include an un-built chassis that, When built will also require a suitable engine, fuel, radio gear etc to complete. . We can supply everything needed to get your model up and running though whichever you choose. If you are unsure of what you need you are welcome to call or email us and we'll be happy to advise.