DESIGN: The Step Club Size Aerobic Platform is a great home-fitness tool for beginners to experts for a variety of aerobic and strength exercises This set includes a grey nonslip platform, 2 patented freestyle risers and 2 original risers to create the foundation of any workout program These sturdy risers can be used on any type of indoor flooring from carpet to concrete to hardwood without leaving behind scratches INCLUDES: Features one (1) stepping surface (43" L x 16" W x 4" H) Four (4) risers (16" L x 16" W x 2" H) WARRANTY: This product is backed by a 90-day manufacturer's warranty period