supply of high back chairhigh back chair,type of chair: high back, tilt mechanism, backrest type: flexi back, locking mechanism: mult i position locking, backrest support type: contoured back / without lumber support, revolving mechanism: designed with 360 degree-revolving type, backrest base frame material: hot pressed plywood, height adju stments: pneumatic/hydraulic, pedestal base: mild steel chrome plated, actual backrest height: 730 millim eter, backrest upholstery material: leatherette, minimum diameter of twin wheel castor (mm): 60 mm, twi n wheel castor material: nylon with pu line, actual depth of seat (mm): 500 millimeter minimum thickness (in mm) of ms plate joining the backrest with seat of the chair: 3 millimeter armrest understructure materia l: ms with chrome plated. [ warranty period: 12 months after the date of delivery ] ] => limited