The Roc N Soc NR O-K Nitro Series Throne features a stand adjustable from 18"-24", and original style black saddle seat. Gas shocks gives bounce to the seat for reduced back fatigue. Easy to use gas lift for quick height adjustments Free spinning seat reduces spinal strain from body twisting Ergonomic seat design helps prevent leg fatigue Nitro thrones are available in all seats sizes and colors Backrests are also available.