... quality guarantee.2,We are profession on producing damper.3,Looking forward to cooperating with you and ... specifications:Usage: office chair,medical bed,office sofaFeatures: 1, Gas: Nitrogen filled inside. 2, Color : black,silver,or ... paint is passed ROHS test; 4,When the gas spring is up and down, it's soomth opration ... We can accept your appionted forwarder. lockable gas spring for office chair