These 1.2mm thick carbon fiber inserts replace the stock plastic inserts and offer improved stiffness and a clean Factory Team look. When switching to the new carbon fiber inserts, it is recommended to use a shorter M3x6mm BHCS (#31531) for the two inner hinge pin locations and M3x6mm FHCS (#31541) for the others. This item fits the following: RC8T3.2 and T3.2e suspension arms #81472, 81476, and 81480.