Bump Rubber. Spring, Helical Spring and Torsion Spring.
A component (mounted in the center of the spring) which cushions the spring as it is compressed.

BUMP RUBBER

Fits S60, S60 Cross Country, S60 Inscription, V60, V60 Cross Country, XC60, XC70

Suspension Coil Spring
Your coil springs are not especially prone to failure, but if they have been cut, clamped, or heated to have the vehicle lowered, your 2011 Volvo XC60 might benefit from replacing the strut springs. Excessive rust can make the springs more prone to failure. Contact your local Volvo service department to have your suspension system evaluated.