Add difficulty and intensity to your aerobic workout--whether in your home or at the club--with this set of ten 4-inch stackable risers, which works in conjunction with The Step stackable workout system. This green riser features a molded, textured surface for secure, slip-resistant stepping and four rubber non-skid feet molded into the base to prevent sliding. It has a maximum weight limit of 200 pounds. The Step is America's original aerobic fitness step system and is widely used by individuals and over 18,000 health clubs. The Step has a patented design for adjusting and stacking platforms together making it suitable for beginners and advanced steppers alike. The Step aerobic activity involves low-impact, high-intensity exercise - recommended by physical therapists and fitness professionals.