One of the companies with the most comprehensive access to the readily available raw plastic materials on the market today is Roncelli Plastics. Over the years, Roncelli has built solid relationships with suppliers of premium materials, such as Polycarbonate, Acetal, PEEK, PPS, and Nylon, to mention a few. Roncelli is a specialist in the machining of rare materials like Torlon and Vespel.