Ergonomic managerial task chair Contemporary square back design Features gas lift seat height adjustment Synchro seat & back adjustment Side tension adjustment Ratchet back height adjustment Supplied with fixed loop arms Black nylon high centre five star base with oversize castors Upholstered in Xtreme plus crepe fabric which features exceptional abrasion & euro flammability performance Available in a wide choice of vibrant fabric colours Also available without arms or height adjustable arms &8211; see below 5 year manufacturer guarantee Minimal self assembly required