Polisport's replica plastics are produced with exclusive technologies to make the product durable and with the same level of quality as the original plastics of your dirt bike. Easy to install. Direct bolt-on. Durable Gloss Polypropylene (DGP) - the first plastic composition for off-road that incorporates a maximum gloss finish with a high resistance to cracking. Injection-molded quality for a perfect O.E.M. type fit. Exact replica of stock O.E.M. air box covers. Inexpensive alternative to O.E.M. replacement parts. Sold as a set (most models, many are individual).