This is a pack of four Flash Point Pre-Oiled Air Filter Foams. Flash Point R/C Pre-Oiled Foam Air Filter can be used with the Mugen Seiki MBX family of buggies and trucks. Keeping your air filter clean and oiled is essential for maximum engine performance and protection. Flash Point R/C Pre-Oiled Foam Filters use a two-stage design that deliver exceptional airflow and prevent dust and dirt from finding their way inside your engine. Each package includes four pre-oiled filters.