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XRAY Progressive Rear Spring Set C=3.7-4.7 (2).
XRA338281
New progressive springs marked 3.7–4.7 are soft at the beginning of the compression (similar to hardness 3.7) but become harder as the spring is compressed more in the middle, with hardness 4.7 at the end. Pearl-grey color and laser engraved for easy identification. Set of 2.