DESIGN: The Step Circuit Size Aerobic Platform is a great home-fitness tool for beginners to experts for a variety of aerobic and strength exercises These sturdy risers can be used on any type of indoor flooring from carpet to concrete to hardwood without leaving behind scratches INCLUDES: This set includes a grey nonslip platform Two (2) patented freestyle risers A streaming videos to create the foundation of any workout program WARRANTY: This product is backed by a 90-day manufacturer's warranty period