Panasonic Shaver Replacement Outer Foil (WES9165PC) keeps your Panasonic ARC 4 shaver performing its best, for a smooth, comfortable shave every time. Over time, your shaver's outer foil can wear too thin, resulting in a lack of flexibility, and cutting parts can become dulled and pitted, creating skin discomfort and a less than satisfying shave experience. In order to maintain the level of grooming comfort and satisfaction that you demand from your Panasonic Shaver, the high-performance outer foil system should be replaced once a year with genuine, easy-to-install Panasonic replacement outer foils. Installation is easy, as parts are designed and assembled to custom fit your shaver model. Simply remove the worn outer foil system and snap the new one into place. Genuine Panasonic outer foils are hypoallergenic and use a distinct foil system that work in tandem to capture, hold and cut different types of hair that make up the beard. The slight arc of the foils keep in close contact with the skin for quick, clean, comfortable shaving. Made from premium, Japanese stainless steel, Panasonic outer foils are precision honed using centuries-old traditions of skill and expertise in crafting the high-quality steels once used to create Japan's legendary swords. This replacement outer foil is compatible with ARC4 men's shavers ES-LA63AA, ES-LA63-S.