The density of our wpc decking is 1.3%-1.4%(1300-1400kgs/cbm). The strength of the hollow one is about 320kgs (That's to say, based on the space between the keels of 35cm, the decking surface can bear the weight of 320kgs.) and the strength of the solid one is 400kgs-500kgs.(That's to say, based on the space between the keels of 35cm, the decking surface can bear the weight of 400kgs-500kgs.)