... . EASILY-MOVED NYLON CASTORS 2. FASHIONABLE APPEARANCE 3. FIRM STRUCTURE ZY-105 office chair components,five star base,office chair mechanism ... -1 seat shell & 703 seat plywood(1.2cm)ZY-018 PP armrests,can pass BIFMA standard(can be changed to ... according to clients' need)Normal gaslift with dustproof cover outside.ZY-PP280, 280mm PP base (can be changed to other materail ...