Air Flow venting on all 4 sides allows for circulation under the platform to prevent grass from wilting if left in place for an extended period. The fiberglass mound can be used indoors or outdoors for throwing batting practice in front of game mounds or in hitting tunnels. The 10-inch height is where hitting coaches prefer it for simulating a game perspective. The platform base is available in white, forest green, and royal blue (custom colors available for an additional fee).