This powerful therapy tool takes little space because four stools can be nested when not in use. They feature a 300-lb. weight capacity. The top surface is low pile carpet to make patients feel secure when doing mobility exercises. Step 1 measures 10"W x 12"L x 2"H. Step 2: 12"W x 14"L x 4"H. Step 3: 14"W x 18"L x 6"H. Step 4: 16"W x 20"L x 8"H.