The Concept2 rower isn’t magnetic; it’s an air rowing machine that produces resistance by moving air over an internal flywheel. Air resistance rowing machines, like the Concept2 RowErg (previously called the Concept2 Model D), have unlimited resistance levels—the faster you row, the more resistance that’s created. They also have a damper, which is an adjustable tab that manipulates how much air gets into the machine. The damper setting doesn’t change the resistance directly, but it does affect the stroke feel.