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This is a pack of twelve replacement 1/8 off road air filter foam elements from Power Save Racing, along with a bottle of Power Save Racing foam air filter oil included. This is a two stage foam with an inner piece and an outer. You can oil just the inner element, or for very dusty conditions you can also oil the outer element. This foam is designed to fit the Mugen MBX5 air filter system, the OS air filter assembly as well as most of the air filter systems from OFNA.