The carbon fiber shield is designed specifically for the MIPS sensors. They provide additional stability and strength to the position sensor while keeping dirt, dust, debris, and moisture from getting into the seals. The MIPS sensor itself is the highest quality position sensor in the market with an IP67 moisture rating. However, these sensors are asked to do a lot of heavy lifting and are often mounted in vulnerable areas of your bike or motorcycle. These shields will do a lot to protect the sensor.