Avita Professional Rowing Machine Ball bearing rollers, ball bearing arms, gas assisted cylinders, 60 minute timer. Very simple technology and easy to lift and store in a closet or other location of your choice. Not fancy technology, but works very well - I have put quite a few miles on it but am getting too old to row unfortunately. Loved how it kept me in overall great shape. Low price to go to a good home. First to come takes it. $50 firm please.