GP Mesh GP-301BH -High Back HEADREST: Height adjustable can be 180 degrees rotated. BACKREST: Black nylon cover upholstery with high quality elastic mesh with height adjust lumbar support. ARM: Height adjustable arm SEAT : Mould foam(PU foam) with fabric upholstery, MECHANISM: Pre-assembled mechanism with unique-designed superior plastic cover under seat, lockable tilting functions GASLIFT: BIFMA standard, high quality gaslift. BASE: BIFMA standard nylon base, R:320mm. CASTORS: BIFMA standard castors.