ZENY 30" Aerobic Step Aerobics Trainer Adjustable Exercise Fitness Workout Stepper Adjust 4" - 6" - 8" Constructed of durable plastic material, features 3 levels that can be stacked to your preference and is perfect for indoor and outdoor use Ideal for workout classes, recovering from an injury, or everyday regular workout routines in the comfort of your own home, office or take it with you to your friends' home, to help you keep fit and enjoy your aerobic exercises Height is adjustable from 4'', 6'', and 8''. Ideal for cardio workout or to strengthen your lower body Platform surface is secure, non-stick, non-slip, and shock absorbing,ensure you exercise easily and safely Platform Size: 30.5(L) X 11.4(W) X 3.5(H); Each Riser Size: 11.8(L) X 3.9(W) X 2(H); Weight Capacity: 550 lbs