Adjustable shocks consist of an oil-filled tube with a piston that moves up and down inside the cylinder. It allows the front tires to lift easily, which aids weight transfer to the rear tires. The advantage of an adjustable shock is that it can be adjusted to add a little extra rigidity to the suspension. Piston valves control the degree of damping by regulating the pace at which oil flows past the piston. Adjustable shocks can be made softer or harder by following the manufacturer's instructions. The adjustment changes the orifice calibration so that the fluid passes through the piston faster to give a softer ride. Some brands can be adjusted to harder levels to compensate for wear. Allowing less oil to get through may result in stronger shocks while allowing more oil to pass through results in less dampening and a softer ride. When the car is not loaded or under typical driving conditions, the shocks can be alleviated of compression firmness and switched to soft. When you change the shock looser or stiffer, you're altering both the rebound and compression. You can control the rebound and compression individually with double adjustable shocks.