Item 15394 FRP Multi Roller Setting Stay is a very popular tuning part for Mini 4WD machines. This new version of the part is now made from 1.5mm thick carbon fiber material, which provides 1.5 times greater strength than FRP plates. This stay can be installed to both the front and rear of your Mini 4WD machine and enables installation of 9mm, 13mm, or 19mm bearing rollers in wide positions.