Swivel Chair Gas Spring with Comfortable Spring Deflection Properties over the Entire Stroke. A comfortable chair, especially at work, can enhance a person’s well-being and reduce stress on the body. In order to improve spring comfort in the standard height adjustment range, Stabilus is offering the STAB-O-MAT CD with comfortable spring deflection properties over the entire adjustment range. The STAB-O-MAT CD has significantly improved spring deflection properties over the entire stroke. Compared with the standard STAB-O-MAT, the CD version does not require additional installation space or extra parts. Like the STAB-O-MAT ID, it provides superior shock absorption in the lowest seat position. A special end stop buffer and integrated depth spring action gently buffer any weight.