Comfortable mesh mid back office chair

1) Mid back ergonomic mesh office chair
2) Mesh back + black PP with fiber back frame + adj. lumbar support
3) Fabric padded seat with injection molded foam inside
4) V-shape fixed PP with fiber black armrest
5) 2.5mm thickness butterfly tilt&lock mechanism
6) BIFMA passed CLASS 3 gaslift
7) 310mm PP base & BIFMA passed 50mm nylon castors