Vary workout difficulty by adjusting platform height from 4″ to 12″ using risers. This system includes a grey High Step platform and four black risers. The platform features a 16″ L x 16″ W x 4″ H stepping surface with a grooved, nonslip surface for added safety. Burn more calories the higher you step with 4″ to 6″ to 8″ to 10″ to 12″ platform height options using the 16″ L x 16″ W x 2″ H risers. Each riser and platform is made with four nonskid feet to prevent sliding or moving during exercise. These sturdy risers can be used on any type of indoor flooring from carpet to concrete without leaving behind scratches. Each platform and riser also feature a resistance band notch, which safely holds the band in place. The Step is a great home-fitness tool for beginners to experts and is customizable for a variety of aerobic and strength exercises. This set is crafted from durable, recyclable high-density polyethylene that supports up to 275 pounds (or up to 400 lbs with risers). Made in the United States.