deso pe(x)-al-pe(x) composite pipes consist of aluminum with an inner and an outer plastic layer. it is tightly bonded with a special adhesive to the aluminum core and all the layers are extruded in one step. deso pe(x)-al-pe(x) composite pipes have all the advantages of both metal and plastic pipes. all of the pap production lines are imported from the swiss swisscab company and implement the ''one step five layer extrusion method'', using the laser welding technique. the raw materials are imported from famous european and south korea companies.