In 18 months, your Braun shaving components cut over 6 million hairs. Over time, the cutting elements naturally wear down. Therefore, we recommend replacing the shaving head every 18 months to ensure your electric razor feels like new again and allows you to shave thoroughly in just a few strokes. By regularly replacing the shaving head, the razor will remain in excellent condition for many years. Compatible with older generation Series 5 electric razors. For Series 5 models from 2020 onwards, please use cutting part 53B.