Bilstein is a German aftermarket and OEM suspension brand founded in 1873 in Altenvoerde now Ennepetal They are best known for shock absorbers struts and performance suspension systems They invented the monotube gas pressure shock absorber in the 1950s and since then their technology has been used by many premium carmakers for both original equipment and tuning applications Bilstein offers product lines like OE Replacement Performance OffRoad and racing Their shocks are made to strict quality standards with extensive testing on road circuits tracks and in lab environments Their aim is combining driving comfort safety and handling across a wide range of vehicles from daily drivers to high performance sports and offroad machines