Unique breathable and expandable mesh materialtilt tension adjustmentTilt Lock MechanismBeautiful Chrome plated steel Base360 Degree SwivelHeight Adjustable Arms with PU PaddedTest standards:a) Armrest: BIFMAb) Base and castor: BIFMAc) Plywood: BIFMAd) Foam: CAL117e) Gas lift: BIFMA.this ergonomic chair is designed to suit everyone. this mesh chair also matches you meeting room.