Durable metal material provides a strong chair base. It can load up to 2500lbs. [4.7 stroke cylinder] The gas lift cylinder (Class 3) length is 268mm and the extension length is 388mm.
Stroke 120mm (4.7 inch). [Smooth and quiet rolling] The desk chair base casters use precision ball bearings to provide smooth and quiet movement. PLEASE MESSAGE US IF YOU HAVE ANY OTHER QUESTIONS, AND MANY THANKS FOR READING ALL OF THIS.