The Expotent clip-on castors are designed exclusively for Professional frames. They are used to transport the tent upright/straight. The clip-on castors can be easily clipped onto each leg of the pop-up gazebo and automatically lock into place with a safety button so they cannot slip off the triangular plate. Each set of clip-on castors includes at least one castor with a brake, so the tent can also be secured against rolling away. Each set also includes a small carry bag, so the clip-on castors can be stored in the bag when not in use or when the tent is in use, and are ready to hand again when transporting the tent.