total core Material:steel tube ,foam.spring,abs total coreMaterial:steel tube,foam,spring,absCarton meas:45X16X54G.W./N.W.:6/6.5kgEasy to use,no matter what your fitness levelsTop quality as you see on TVFolds away for easy storageConveyance:720pcs/20GP 1540pcs/40GP 1820pcs/40HQ total core