BUTTERFLY MESH BACKADJUSTABLE HEAD RESTADJUSTABLE LUMBER SUPPORTADJUSTABLE ARMREST W PU PADSYNCHRO TILT MECHANISMGASLIFT 100MM ( BIFMA CERTIFIED)NYLON BASENYLON CASTER (BIFMA CERTIFIED)One Year Warranty Only For Manufacturing Defects, Not For Any Physical Damage.Delivery within 4 days.