This is a very good all around shock valve, it has some rebound effect while still having bleed that allows weight to transfer to rear tires off corner exit. Can be used in about every class of racing. 

Canedit compression side to needed rate for both car and track conditions. 

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7 rebound 2 compression @ 100 psi 

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Shock is marked as:

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RF1-50 / 130 

RFHD + 130 old call out

RFHD

RF2