Central Air A-C DraftShields&reg; 12"x12" Cover 10-Pack The most effective means of sealing your air-conditioning system registers Keeps cold air from entering your home through your air conditioning ducts during the winter Clear plastic cover with a closed cell foam gasket around the edge to insure a tight seal, a lanyard, and a hook The cover is made from recycled plastic No permanent hardware is required & re-usable every heating season