Panasonic WES9839P Men's Electric Razor Replacement Inner Blade & Outer Foil Set
Panasonic Replacement Outer Foil and Inner Blade for ES-RW30-S and older models ES4026CMB, ES2046NC, ES4815S.  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