Windmaster 4101 Slide-in curb sign for 22x28" signsWindMaster Slide In Curb Sign with rolling base Model 4101 is double sided and has slide in frames for top loading access. 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 exclusive tool free assembly and feature