The Step Freestyle Aerobic Risers &ndash; Health Club Size Made in the United States from durable, recyclable high-density polyethylene Two freestyle grey aerobic risers for use with The Step Aerobic Platform  Health Club Size Four nonskid feet on each riser prevent platform from sliding or scratching floors Intensify and diversify your workout using freestyle risers in a variety of slated positions Each riser measures 16 L x 16 W x 2 H  compatible with 40 L x 14 W x 4 H Health Club Platform