gas spring,chair gas spring,office chair gas spring,gas cylinder,gas strut gas spring,chair gas spring,office chair gas spring,gas lift,gas cylinder,gas strut 1. Stroke option (mm): 65/85 / ... 5.1(Impact testing,swivel testing,fatigue testing,back strength testing,bushing testing) + TUV safety ... stool/ Executive Chair/ Lift Chair/ Leisure chair for home furniture7. Pressure (N):300--450,the ...