Mesh: LVB-400 series/LVB-600 series
Seat fabric: OS-300 series
Headrest: Adjustable mesh headrest
Frame: Grey plastic+ glass fiber frame
Back: Adjustable lumbar support
Arm: 4D adjustable armrest with PU covered
Foam: Good quality molded foam
Mechanism: 4 positions lock weight-sensitive synchro tilt mechanism, tension auto adjust. 
Gas lift: 85mm extended length, Class-3 gas lift
base:350 chrome base, 60/25 PU caster
*HY2134-01(black) 3D mesh optional, price higher(3.5usd)