Just the feel of the plastic itself when you hold it Im afraid, so if your gonna buy them from ebay just on pictures then it'll probably be a little late to know... rumble's red parts seem to be a little bit brighter red than that of the original. I cant say for ravage though - I only have a fake rumble/ laserbeak which I bought CURIO SAKE....
Wanted AM partner Vanguard, Myclones Dirge, G1 Victory Leo, e-hobby Dark scream ( the black version), e-hobby Magnificus
Parts- AM partner Basher-side guns, G1 Actionmaster Elite Windmill's blades[I][B]