If you are wanting to have a dual colored body on a different color tail that the tail cavity is on both sides of the plates a dual injector is needed or at least with the molds I've had. You could get around this and do cutting of the body but I don't prefer this. If your tail cavity is only on one side of the mold, I believe the Do-It stingers are this way, you could simply place tail in mold and do a laminate. My carrot, willow tail and tadpole curly tail have the tail cavity on both sides of mold therefor I have to dual inject onto a different color tail if I'm feeling fancy.