This is our latest shock set for Savage-X, 21 & 25, special clear o-rings provide smoother shock movements. Super Heavy-duty damping action, piggyback contains real shock oil reservior, internal volume compensation allows you to land big jumps, standard 2 hole pistons. The MSR4 shocks provide superior off-road & on-road capability, include slightly harder springs, extra 1 hole & 3 hole pistons, fully extended shock length (mount to mount) = 162mm