StaffanSTAVEN's dampers are equipped with a spiral spring - it comes in 4 different types.  Super-Elite, Elite, Normal and Soft.  All have the same outer dimensions and are easily interchangeble.

The ski pole damper is equiped with a coiled spring - it comes in 4 different "flavors" - Super-Elit (not for the good skier but for the very best), Elite for the good skier, Medium for any one of us and Soft for the beginner or the very old.