This is a Graupner Premium Line.I wasn't happy with the universals and plastic 3 bladed props.Replaced the universals and changed props to 4 bladed brass.Also changed the prop shaft to a threaded 4mm shaft which I happened to have in my spares.She runs a lot better now with these changes.Still to come is lighting and sound. (Motor: 2-550 motors) (ESC: 50amp) (8/10)