MySit Fix Sinking Office Chair, Chair Saver Kit, Office Chair Saver Universal Size 25mm-28mm for Stop Sinking Height Adjusting - No Cylinder Replacement, No Tools Required - 2 Pieces

MySit Gas Lift Cylinder Removal Tools 28mm/1.1-Inch, Removal Tools Sets for Replace Office Chair Cylinder, Fix Sinking Office Chair Stainless Steel Chair Saver for Stop Sinking - 2 Pieces

DOZYANT 8" Long Stroke Office Chair Gas Lift Cylinder Replacement,Hydraulic Pneumatic Shock Piston Heavy Duty (450 lbs) for Tall Person Universal Size Fits Most Executive Chairs, Highest End Class 4