Pneumatic cylinder cartridge strut gas spring replacement for standard office chair pneumatic cylinders.  This cartridge has a 5" stroke / travel. Typically used on task chair. 

Main body is 1.1" (28mm) diameter and is 10.2" long (not counting solid rod). Please measure the existing piston body to confirm it is between 9.7-10.7" long and ensure the travel is no longer than 5.5".

The tapered end that goes into the seat plate / mechanism has a standard 17-4 taper. 

We also carry the 9" long cartridges in our eBay store: CC-9.