The K& N E-4517 replacement air filter is constructed using an oil-free synthetic media. It has an inner wire support that provides extra strength to protect the air filter under extreme conditions. A tube of sealing grease is provided to help ensure an airtight seal. This air filter fits some John Deere and Briggs & Stratton tractors in addition to other applications. The E-4517 provides superior filtration protecting your equipment's engine. This K& N air filter can be cleaned and it comes with a lifetime limited warranty.