This concrete bollard is unshakeable at 315 lbs. but still moveable if needed making it great for park events, downtown districts, and street markets. It is made of commercial grade concrete that is reinforced with 1/4" thick steel rebar ensuring long-lasting quality. The octagonal base is 22" round with a sharp taper to a mere 8" round, ideal for foot traffic and discourages bike and skateboards. If desired, this bollard can be mounted as well. We recommend mounting on a sturdy surface such as concrete to prevent the risk of sinking into soft ground. We also back this American-made product with a 2-year commercial warranty.