The cylinder is filled with a liquid or solid polymer material having {HEAD ~ a high bulk modulus} of {TAIL ~ compressibility} which gives the spring volumetric stiffness 
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The cylinder is filled with a liquid or solid polymer material having { HEAD ~ a high bulk modulus } of { TAIL ~ compressibility } which gives the spring volumetric stiffness
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH