1.Chair Components,Gas Spring, Gas Lift 2.Model:NT-B, NT-C 3.Warranty:5years 4.Test: SGS BIFMA X5 ... spring/gas lift/gas cylinder/gas strutUseUsed for boss chair/ office chair/bar chair etc.QualityNANT Gas Spring have good reputation all over ... .TypeStroke for different kind of chairs.Boss chair: 60mm, 80mmOffice Chair: 100mm, 120mm, 140mm, 160mmBar Chair: 180mm, 200mm, 260mm, 330mmSampleAll the samples ...