Outdoor Message BoardStanding a full 45 inches tall, this sign is mounted on two heavy duty steel springs in the base, allowing the sign to gently sway in the wind. The unique aluminium frame design allows for easy replacement of your stock or custom message. Although sturdy as is, the silver colored hollow plastic base can hold water or sand for additional ballast. Moving this sign is easy, just tip and roll since the base has a convenient molded handle and two wheels.