Oka-H, Boss executive black high back mesh office chair sillas de oficina with 2D lumbar support adjustable armrest ergonomic chairs height adj. des 2) Mesh back + 2D

2) Mesh back + 2D lumbar support & nylon back frame & 2D headrest

7) BIFMA passed 340mm black nylon base with BIFMA passed 60mm nylon PU castors

other is with 1

5mm thickness plane tilt&lock mechanism

350mm chrome metal base + BIFMA passed 60MM nylon castors

Oka-H, Boss executive black high back mesh office chair sillas de oficina with 2D lumbar support adjustable armrest ergonomic chairs height adj. des 2) Mesh back + 2D1) High back ergomonic mesh office chair with 2D headrest & cloth hanger 2) Mesh back + nylon back frame +2D lumbar support ( botton with three colors for options, black blue red) 3) Fabric padded seat with injection molded foam inside + plastic cover 4) Height adjustable armrest with soft PU armpad 5) Multi functional mechanism with back reclining & 3 positions locking function 6) BIFMA passed CLASS 3 gaslift 7) BIFMA passed 340mm nylon base + BIFMA