FRAM CA3903 Extra Guard Rigid Panel Air Filter Provides more air flow for improved performance Contains a high efficiency blend of round and synthetic fibers Traps more dirt without decreasing air-flow Traps dirt inside tiny microscopic channels to trap more dirt without a subsequent increase in air flow restriction Please note that Fram is making ongoing changes to their packaging to reflect the new name "Extra Guard". Regardless of whether box received displays "Extra Guard" name or not, the filter inside has not changed. Provides more air flow for improved performance Contains a high efficiency blend of round and synthetic fibers Traps more dirt without decreasing air-flow Traps dirt inside tiny microscopic channels to trap more dirt without a subsequent increase in air flow restriction