The PosterGrip® side rails that snap open for easy access. Its tall, narrow size is unique and eye-catching. The molded base can be weighted with water and is equipped with two built-in wheels. The wheels will engage when the sign is tilted to allow for it to be easily rolled into position. When the sign is in the upright position, the wheels will disengage. WindMaster Curb Signs have an MDI Worldwide exclusive tool-free assembly and feature impact-resistant fluted polypropylene, non-removable backing members. The optional clear protective overlays will assist in keeping marketing materials safe from the elements, however, all printing should be done on a waterproof, outdoor grade material for optimum performance. Made in the USA.