The USED Kinetic Z-Rollers are a set of rollers made of plastic, metal, and steel that can be attached to your bike to turn it into an exercise bike. Designed for indoor biking, this innovative product helps you convert your regular bike into a fitness machine for a full-body workout. Whether you are looking to add more cardiovascular exercise to your routine or simply want to try something new, the Z-Rollers offer a unique and effective way to turn your bike into a versatile exercise tool.  THE KINETIC Z-ROLLERS ARE IN VERY GOOD, CLEAN USABLE CONDITION.  THIS ITEM WEIGHS 23 LBS.  THE BOX MEASURES 24 X 22 X 11.  THE CORRECT SHIPPING PRICE IS $88.00.