This small artificial rock from Outdoor Essentials® is hollow and has no bottom. Use it to hide unsightly things like well heads and drain tiles. It looks so real people won’t know it’s fake. The 6-pound rock is made of strong fiberglass composite that’s lightweight and easy to move. Available in tan or gray. Colors will vary from the pictures because each rock is hand painted in blended colors for a natural look. SIZE NOTE: Interior dimensions are not uniform. The interior shape matches the exterior shape, so the height and width will not be the same across the entire rock. The size given is the overall dimension. 5-year limited warranty.