The spring joint's damping ratio. A value between [code]0[/code] and [code]1[/code]. When the two bodies move into different directions the system tries to align them to the spring axis again. A high [code]damping[/code] value forces the attached bodies to align faster.
The higher the value, the less the bodies attached to the joint will deform it. The joint applies an opposing force to the bodies, the product of the stiffness multiplied by the size difference from its resting length.