A single spring with damper for our line of hydraulic roller camshafts. 130 lbs of seat pressure @ 1.750" installed height and 325lbs at 1.200" with coil bind at 1.150". Outside diameter is 1.250" and inside is .880". Max lift is .550 in. A perfect spring choice for our Super L98, ZZ9, and ZZ409 camshafts. Choose the 6.SPS510 Spring seat and 6.RET510 Ultra light steel retainers for this spring. Sold as a set of 16.