Tama HTS7B - 1st Chair Ergo-Rider Drum Throne - Seat OnlyThe Ergo Rider provides absolute ergonomic comfort and support. The hybrid of a round seat and a saddle style seat, it offers the maneuverability of the former, and the playing support of the latter. The front cutaway allows unimpeded thigh movement even during the most rapid double bass patterns. Upgrade or replace your current worn out seat. Fits base pipes from 19. 1mm to 25. 4mm (0. 75" to 1") in diameter.