The average Braun shaver cuts 6 million hairs every 18 months. This means the head will gradually wear out and your shave can become less close and comfortable. That's why Braun recommends changing your shaver's foil & cutter block every 18 months to get your shaver back to its best. Take care of your shaver, and it will take care of you. Box includes: 1 X Series 9 Pro Shaver Head Replacement Features: Peak performance - To maintain your best shave, we recommend replacing the Series 9 Pro head every 18 months The Series 9 Pro head captures more hair in the first strokes, for an exceptionally gentle shave Aiming for zero evening beard - The Pro Head with our unique ProBlade shaves hair below 0.05 mm—delivering a close and gentle shave that lasts Simple replacement - Easily attach your new shaver head—just by clicking it on Quality craftsmanship - 100% made in Germany and compatible with Braun Series 9 Pro and Series 9 shavers Specifications: Dimensions: H:2.1 x W:4.5 x D:2.0 c