MAPEX Drum Throne (T561A) The medium diameter of the 13 x 2.5 round seat makes it easy to pack inside the hardware bag or with a drum in a case. Mapex Throne Round Top The medium diameter of the 13 x 2.5 round seat makes it easy to pack inside the hardware bag or with a drum in a case. 13 Wide x 2.5 Thick Round Cushioned Seat Soft but Durable Vinyl Covering