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 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 with fixed loop arms or height adjustable arms &8211; see below 5 year manufacturer guarantee Minimal self assembly required