Very stiff item. Stops castor/camber changes as a result of rubber bushes flexing in top mounts, yet design allows a change in static camber and castor to allow a more precise steering "feel". Also allows smooth, fluid movement of spring platform. Machined in high quality aluminium to GBE designs. Essential if you have GAZ, AVO, etc coilovers...Does increase vibration levels, so be aware of this. THIS IS FOR ONE PAIR - IE. ONE CAR's worth