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813B
1) Middle back chair
2) back:mesh, seat:fabric
3) hight adjustable armrest
4) seat molded foam with the seat cover
5) E1 plywood for seat
6) auto-weight mechanism (3 degree locking)
7) class 3 gas lift pass BIFMA test
8) 340mm nylon base
9) 60mm nylon castor( pass BIFMA test)
