This shock set from Integy is for the Savage .21. These MSR4 shocks provide superior off-road & on-road capability. Includes standard 2-hole pistons with extra 1 & 3 hole pistons. Features super heavy-duty damping action and fully extended shock length. The piggyback contains a shock oil reservoir, and the internal volume compensation allows you to land big jumps. Special o-rings provide smoother shock movements. Part number: INT T7014S.