Enhance your door hanger theme with Topper Trio sets. Each set is attached to a Topper Trio Base which is then hung onto the door hanger. It is all attached using hook and loop tape. The Topper Trio Base is a one-time purchase which can be used with all Topper Trio Sets. You must have a Topper Trio Base in order to utilize the Topper Trio Sets on your door hanger.