This is a YAMAHA drum throne. It was used indoors only for approximately 7 years as an accessory for an electronic drum set. The cushion underside is marked "DS550," but the details differ from the catalog model, such as the lack of sleeves on the leg base as shown in photo 5. The legs show noticeable surface rust overall, but the seat has few tears and little wear, and can still be used. One of the three tuning keys in photo 6 will be included (selection not available).