【Premium and Efficient】: Factory filter, high-quality filter paper, metal mesh protection design, filter paper filtration efficiency up to 99%, and can effectively reduce engine noise. Reduce the fuel consumption of the machine and protect the lawn. 【Air Filter】: Our air filters prevent the engine from ingesting dirt, improving performance and extending the life of the engine. Good working conditions and easy installation. The metal mesh protection design makes the air filters more durable, providing reliable and long-term protection for your lawn mower tractor. 【Engine Parts】: The air filter is a great replacement for Briggs Stratton 491588 491588S 399959, for John Deere PT15853. They also work with other models. 【About Size】: Packing list: 5 x Air Filter. Length: 5-1/4", Width: 4 1/2", Height: 13/16". Good working condition and easy installation.