The K&N E-4505 replacement air filter is constructed with an oil-free synthetic media. This high performance air filter provides low restriction, a longer service interval and excellent filtration to protect your engine from unwanted dust particles. This K&N air filter can be repeatedly cleaned and used again, lasting the life of the engine. The E-4505 comes with a top plate and rubber washers to secure the air box after installation. The K&N E-4505 air filter is quick and simple to install and is custom designed to fit in select Honda small engines, as well as other small engine applications.