The gas-filled shock absorbers PINASCO double effect represent the technological evolution in the field of adjustable suspension respecting the CE regulations. The PINASCO shock absorbers are made with the highest quality material MADE IN ITALY, aluminum ferrules recording billet, support spring steel CNC machined and chrome-plated, spring dual calibrated effect of harmonic steel. The force of a shock absorber reaction is given by the resistance that the oil contained in it encounters in passing through the valves, consisting of calibrated holes and shutters preloaded discs. The suspension, by means of an adjusting ring millimeter, is able to preload the spring and to create a compression calibration that varies according to the needs of the pilot.