Spring, Valve, Dual, PAIRDual, 45 lb at .815", Large diameter spring, Alum Retainers required, Coil bind at .400. 8500 max RPM, Roller or Billet Rocker arms and CM Pushrods Required. Excellent durabilityFits all Honda GX120 to GX200s, 6.5 Chinese OHVs, and non-hemi Predators. Will not work with new style Predators unless springs pockets are cut and longer valves are used.Note: Actual coil bind is dependent on several factors including valve length, retainer style, keeper style, and valve height. Figures given are for reference only. Seat pockets for dual springs can typically be cut an additional .050