We have own machine of tube what comes from German Shoelar Company. The tube includes two side cladding, outside cladding and without cladding. Our high frequency welded tubes sales possess about 60% Chinese tube market. Rongteng Imp&exp Co., Ltd is a engaged in researching and developing large radiator and odd radiator, especially developing aluminum radiator instead of copper. In last year we completed the task of researching & developing alumnium industrial radiator from copper&brass radiator for American OEM . They are used in mobile machinery shop. Now we are also advancing large radiator for Middle east customers.