... ,gas spring,gas lift,gas cylinder,gas strut office chair part,chair part,furniture part,gas spring,gas lift,gas cylinder ... : Folded type or welded type or with deeper taper for high chair bases5. Certificate: ISO9001 + SGS BIFMAX 5.1(Impact testing, ... 3/class 4)6. General use: office chair/ furniture chair/ bar stool/ Executive Chair/ Lift Chair/ Leisure chair for home furniture7. Pressure (N):300--450 ...