Panasonic WES9064PC Men's Electric Razor Replacement Inner Blade
Panasonic Replacement Inner Blade for ES-RT51-S, and older shavers ES7035, ES8043, ES8152, ES8092, ES8094, ES8095, ES8096, ES8097.  It is recommended that you replace the outer foil at least every year to maintain your shaver's cutting performance and the inner blade every two years