Oka-H, Boss executive black high back mesh office chair sillas de oficina with 2D lumbar support adjustable armrest ergonomic chairs height adj. des 6) 350mm aluminium base with

6) 350mm aluminium base with BIFMA passed 60mm PU nylon castors

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

5mm thickness butterfly tilt&lock mechanism6) BIFMA passed CLASS 3 gaslift7) 320mm black PP base + BIFMA passed 50mm PU nylon castors

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

other is with 1

Oka-H, Boss executive black high back mesh office chair sillas de oficina with 2D lumbar support adjustable armrest ergonomic chairs height adj. des 6) 350mm aluminium base with1) 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