Amscan International Time to Party Hanging String Decoration 18 These awesome 18th Birthday Hanging Decorations give you a massive 42 feet of decorating potential! It consists of 6 strings of Black and Silver foil 18's. Each string is approximately 7 feet, which gives you a total of 42 feet of draping decorations to work with! You can dangle them from the ceiling, drape over windows, shelves and doors or just wrap birthday presents with them!.&lt;br&gt;