The Step Original Aerobic Platform is a residential, compact platform with a 28.5″ L x 14.5″ 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″ platform height options using the 14.5″ L x 9.5″ W x 2″ H risers. Each platform and riser 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 to hardwood without leaving behind scratches. Each platform and riser also feature a resistance band notch, which safely holds the band in place. This set is crafted from durable, recyclable high-density polyethylene that supports up to 275 pounds (or up to 400 lbs with risers). Sets include a grey platform with black risers. Made in the United States.