Yes4All 16"x16" Adjustable High Step Aerobic Platform with 4 Risers, Height-Adjustable 4"-6''-8''-10''-12" Step Aerobics Platform for Home Gym Exercise Fitness Workout16 x 16 x 4 inches anti slip platform: slip resistant, shock absorbing high step aerobic platform with four additional removable 16 x 16 x 2 risers provide a steady, safe, space efficient and comfortable step workout experience Easy height adjustment: increase workout difficulty and tweak your aerobic exercise routine according to your fitness level by adjusting platform height from 4 up to 12 using 4 additional stackable risers High density