These are Kyosho factory replacement 4.7mm pivot balls for the Mini-Z MR-03 chassis, sold as a set of two. The hard fluorine coating reduces friction at the suspension pivot points, helping to maintain consistent steering and suspension geometry. A direct-fit replacement for worn or damaged pivot balls on MR-03 builds. Features: 4.7mm diameter pivot balls Hard fluorine coating for reduced friction Designed for the Kyosho Mini-Z MR-03 chassis Sold as a set of two 7/7/26 cs