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): ... /chromed4. Bottom Type: Folded type or welded type or with deeper taper for high chair bases5. Certificate: ISO9001 + ... Inner tube thickness:1.5mm/2.0mm/2.5mm with hard chromed or QPQ finishment9. Outer tube thickness:1 ...