The Brute Force DryFlow Air Filter is a durable filter that is a favorite in rough, dusty racing conditions. They are specially designed for tough off-road applications and provide outstanding levels of filtration efficiency and capacity. These filters have a gray colored filtering media and are oil-free. Their synthetic media is incredibly easy to clean... Brute Force DryFlow filters are very durable, but not as rigid since they don't contain screen. There is no risk of filter damage during shipping, installation or cleaning. These Dryflow filters will retain their shape and performance even after abuse. Most Brute Force Dryflow filter elements are reinforced with a lightweight mineral-reinforced plastic cage that maintains the element's structural integrity and prevents the filter from collapsing from flow demands.