... gas spring,gas lift,gas cylinder,gas strut office chair part,chair part,furniture part,gas spring,gas lift,gas ... SGS BIFMAX 5.1(Impact testing,swivel testing,fatigue testing,back strength testing,bushing testing) + TUV safety certification(class 2/ ... /class 4)6. General use: office chair/ furniture chair/ bar stool/ Executive Chair/ Lift Chair/ Leisure chair for home furniture7. Pressure (N):300-- ...