Fitnex Kids Indoor Cycle Trainer is great for a school environment. It offers a strong - sturdy - and safe design for elementary children to have a unique exercise product. After years of testing - FMI created a new revolution in the indoor cycle market. Designed especially for the body sizes of children - teens - and Little People from 40 to 63 in. X5 will rapidly become a standard tool for family fitness and weight management. 14-gauge steel tubing. * Comfortable user height 40 to 63 in. * 16.5 pound flywheel * Free wheels when the rider stops pedaling * Safe - sturdy design for safety * Long life 6003ZZ roller bearings