Within 18 months, Braun shavers cut an average of 6,000,000 hairs - that comes with some gradual wear to the cutting parts, which can lead to a less comfortable shave. That’s why Braun recommends changing your shaver’s foil and cutter block every 18 months, to get your shaver back to its best. Take care of your shaver, and it’ll take care of you! This shaver head’s 360° adaptation makes for easy shaving even in tricky areas. While its four synchronized elements are designed capture in one stroke, what other shavers do in two (proven on a 3-day beard. IPI Research Institute, February 2015), for a quick and efficient shave everytime. Features and Benefits 18-month lifespan- To maintain your best shave, we recommend replacing your shaver head every 18 months. Simple replacement- Easily attach your new shaver head, just by clicking it on! Versatile- Compatible with Series 7 (new generation) electric shavers. Specifications Dimensions: H4 x W3.5 x D3cm Colour: Silver Lifespan: 18 months