The Pedlar^® is an economical, light-duty exerciser and rehab aid. One knob adjusts pedal resistance from zero to quite difficult levels. Any comfortable chair can be used, making this an ideal exerciser/rehabilitation device for any age (up to a moderate ability). Features a heavy-duty steel frame and a robust resistance adjustment mechanism. Rubber feet keep the unit in place & protect the floor. We feel this is the best quality rehabilitation unit on the market -- don't be fooled by "look-alikes".