office chair gas spring custom make 100mm 120mm 140mm 160mm stroke SGS ... spring/gas lift/gas cylinder/gas strut Used for boss chair/ office chair/bar chair etc. Stroke for different kind of chairs.Boss ... chair: 60mm, 80mmOffice Chair: 100mm, 120mm, 140mm, 160mmBar Chair: 180mm, 200mm, 260mm, 330mmOuter tube color: Powder ...