It is a kind of pneumatic rod, including the outer welded pipe, precision seamless steel tube, valve body, valve core, piston rod, seal and plastic parts and a series of accessories assembled. Then inject nitrogen, which enabled the seat to have lift adjustment function. It is widely used in office chairs, bar chairs, conference room chairs, boss chairs, beauty chairs etc.It has the following general types:

1. Swivel chair gas spring; 2. Double conegas spring;  3. Bar chair gas spring; 4. Non-rotatingspring; 5. Non-lifting spring; 6. Auto-return gas spring