Materials:
1. Backrest: Fabric
2. Seat: High elastic foam wiht fabric cover.
3. Base: Black nylon star base.
4. Castor: Black nylon castors.
5. Lumbar cushion: S shape abric with sponge.
6. Armrest: PU cover.

Functions:
1. Mechanism: Manual-controled, multi-angle tilt lock.
2. Lumbar cushion: Adjustable(up & down)
3. Seat height: Adjustable(up & down)
4. Armrest: Height adjustable, left and right twistable.
5. Seat slide: Forward& backward slidable.
6. Seat tension: Seatrest can be adjusted to user's ideal tension.
7. Seat width: Width extentable.