... water proof cartonManufacturing specification for reference: Type Tube diameterPiston rod diameterstrokeForce(N)Compression gas spring 12420-5040-20015650-15040-300186/850- ... ,just like the gas spring, compression gas spring, free gas spring, lockable gas spring, locking gas spring, elastic lockable gas spring, rigid lockable gas spring,gas struts and door closer. pictures: gas spring for TOYOTA/car ...