DESIGN: The Step Fitness High Step is a great home-fitness tool for beginners to experts for aerobic and strength exercises It includes a blue High Step platform and 4 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 without leaving behind scratches INCLUDES: The platform features one (1) 13" x 9" stepping surface Four (4) risers (16" L x 16" W x 2" H) WARRANTY: This product is backed by a 90-day manufacturer's warranty period