Made of plastic, the Swiveling Bucket Top Seat is designed to attach to the top of most 21/2- to 7-gallon buckets. Some seats are circular and cushioned, while others are molded, ergonomically shaped plastic. Under some of the circular cushioned seats, a section provides direct access to the bucket's contents without having to remove the lid. The seat without the bucket can be used on any flat surface (e.g., bleacher).