Fitmax Professional (42.5x21x45.5") Lightweight Marine Grade Steel Aquabike With Easy Turn Knob Resistance System For Exercise And Weight Loss ENJOY BETTER WORKOUTS Adjust your resistance using our easy to use resistance knob get real resistance while riding. Unlike other bikes no need to stop pedalng each time you want to adjust. More intense fat burning workout sessions every time you use it! LEAVE IT IN THE POOL Our bikes are made out of marine grade 316 stainless steel superior and more rust resistant than aluminum. They are salt water, bromine, and chlorine safe SCRATCH RESISTANT BOTTOM Our bike bottoms are specially designed to protect your pool surface EASY TO TRANSPORT Our lightweight bicycles have non jamming wheels in front for easy transportation and storage BETTER RIDING EXPERIENCE The handlebars and cushioned seat are all easily adjustable for comfort and ease of use