Rhino Filters is the new name in carbon Filters. We have gained world-wide recognition for producing the best carbon filter in the world. We have a contract to purchase RC412 carbon from Tiwest in Australia and have a large manufacturing facility in China. We ship our carbon direct from Tiwest to China and then distribute around the world. This results in a considerable cost but does guarantee the quality of the carbon we use. We only manufacture Rhino Pro and Rhino Hobby Filters and we do not make filters for anybody else.