Much More Racing Speed Controller Fan Protection
This item from Much More Racing protects the fan and its blades from any external damage that can be caused by small debris. There are four different colours to choose from, (black, blue, cobalt blue, red) so you can easily match this to the colour of your body shell, car or speed controller.
MR-FPPK/MR-FPPB/MR-FPPC/MR-FPPR Fan Protect Plate
Source: Much More Racing