These heavy duty shocks have been a staple of the VW industry when a reliable rear shock is required. The Gas-A-Just is not user adjustable, but is self regulating to compensate for temperature and wear variables. We routinely use these units for off-road or autocross use. These are the “white” colored shocks that veteran VW guys remember, but now they are painted silver or black! It’s the same reliable product. Sold each.