These Cardio Kids Steppers are built tough for heavy usage. Designed with an almost infinite adjustability for tension and speed control - the shock can be mounted in any of three positions depending on the average user weight. Shipped freight, fully assembled, sized and proportioned for children. The Steppers have hydraulic adjustable cylinders to quickly change resistance levels. Choose from 3 sizes: • ELEMENTARY 42"L x 30"W x 56"H. Weighs 95 lbs. For ages 7-11 • JUNIOR HIGH 42"L x 30"W x 56"H. Weighs 95 lbs. For ages 10-15. • HIGH SCHOOL & ADULT 42"L x 30"W x 56"H. Weighs 95 lbs. For ages 14+