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Description:Our piston and valve seat enjoy good reputation, as we have many advanced equipments such as 50T, 60T, 100T Auto Mechanical Compact Press, Pedrail ltrasonic cleaner line to guarantee the quality and cleanness. 1. Density of piston: 6.3g/cm3 2. Density of valve seat: 6.5g/cm3 3. Density of guided seat: 6.7g/cm3 4. Hardness: 60-70 HB 5. Purely cleanness 6. Steaming Treatment We offer customized shock absorber piston and valve seats !