A high-efficiency air filter made from flexible expanded polyurethane on a polyester base, specifically for the Piaggio Beverly 350. It consists of two layers of foam, a finer light blue one and a black one. The outer surface allows a greater intake of air flow while holding back 50% more of the dust particles. Polini's air filters replace the standard ones with no modification and improve the air flow. Thanks to their ability to filter the air, they optimise the air-fuel mixture, improving the engine's performance.