I have had mine for many many years. I just keep a close eye on them.

Also, I am extremely careful not to stretch or twist them when changing pads, calipers, struts or half shafts. I also have them mounted through a stock bracket attached to the strut--always properly supported-- and they are covered in spriral convoluted split nylon tube.

Unless you crash the car, these should last may seasons taking the foregioing preventative measures.

I do not consider them wear items or consumables.