30' Fitness Aerobic Step Adjust 4 - 6 - 8 Exercise Stepper With Risers Size: Platform Size: 30’’(L) x 10.6’’(W) x 3.5’’(H); Each Riser Size: 11.8’’(L) x 3.9’’(W) x 2’’(H) Material: Plastic Color: Black Color Mapping: Black Gender: Unisex Age: Adults