If you need a replacement sensor magnet for your Magura brake system, this is exactly what you're looking for! This little magnet is crucial for your bike's speed sensing function and fits perfectly with several Magura rotor models. It's compatible with Storm HC rotors (specifically the 180mm version), MDR-C rotors in both 180mm and 203mm sizes, and MDR-P rotors too. The installation is straightforward - just make sure it's properly aligned with your sensor for accurate speed readings. Whether you're replacing a lost magnet or upgrading your existing setup, this OEM-quality part ensures your bike's computer and ebike systems work correctly. It's one of those small but essential components that keeps your cycling experience smooth and your bike's electronics functioning properly. Always double-check compatibility with your specific rotor model before ordering, but if you have Magura brakes, this magnet should do the trick!