Cheap, Effective, and Easy to install alternative to gas cylinders. Takes Seconds To Fit. Stops Your Office Chair Sinking When The Cylinder Fails. No Tools, Screws or Disassembly of Chairs or Cylinders Required. Universally Fits All Height Adjusting Gas Cylinder Chairs.PRODUCT DESCRIPTION You know that sinking feeling you get when your home/office chair starts dropping. Fitting a new gas cylinder can be time-consuming and complicated. The Dropper Stopper stops you from throwing away your office chair. Universal: Fits any gas lift chair. No screws or tools required., Simply clip the Dropper Stopper to your sinking chair, it takes seconds. (Instruction leaflet included).