1st Chair Backrest Attachment Sitting on a throne for a long period of time is tough on your back. You could get a throne with a backrest-but they're a pain to transport because they don't fold up. And if you're a player who leans forward, they're no help at all. Unless you get a 1st Chair backrest. The HTB5 can be adjusted up and down AND forward AND it can be detached from the seat when the gig is done. Slick! *This backrest is designed specifically for 1st Chair Drum Thrones (Excl. HT230/HT250).