Toy-grade R/C car are commonly manufactured with one focus on design and reducing production cost. We can know about rc cars electric from
http://www.xhobbystore.com/rc-cars.html. Whereas one hobby-grade vehicle has one standardized motor and different electronic components which are individually replaceable and if they will fail, doll grade cars are commonly made to one non-standard motor, non-replaceable box components and one single electronic circle board included to the design of both the vehicle.