AB rocker material:steel tube.foam sprig,abs plastic AB rocker material:steel tube.foam sprig,abs plasticpacking size:71X18.5X34CMN.W./G.W.:5.5/6.8kgFolds easy when not in useRolling,Massaging backWhen you use it,you can get like a massager Conveyance:576pcs/20ft 1220pcs/40ft 1445pcs/40HQ