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Panasonic Replacement Inner Blade WES9850P for ES-RW30-S and older models ES4025, ES4026, ES4815S. To help maintain the level of grooming performance you demand from your shaver, It is recommended that you replace the shaverâs outer foil at least every year* to maintain your electric shaver’s cutting performance and the inner blade every two years. DISCLAIMER: *Based on once daily shave usage of 3 minutes. Replacement schedule varies based on an individualâs hair type and thickness as well as electric razor usage schedule.