Movement God High Step Adjustable Workout Training Aerobic Step Set of 2 risers that measure 16" by 16" Non-slip Surface on Platform that Supports Up to 500LBS Adjusts From 5 to 7 to 9 for All Heights and Fitness Levels Dimensions (cm): 25.57L X 11.42W X 4.89H Money Back Guarantee If You Will Be Not 100% Satisfied with Your Purchase