The Step High Step Aerobic Platform Made in the United States from durable, recyclable high-density polyethylene High Step (16 L x 16 W x 4 H) aerobic platform, 4 risers, and streaming videos Platform features grooved, nonslip top and supports 275 pounds Four nonskid feet on each riser and platform prevents sliding or scratching floors Vary workout difficulty by adjusting platform height from 4 to 12 using risers