This is a set of replacement 6.8mm Hard Anodized 7075 Aluminum Balls, intended for use with the Kyosho MP9. These are used on the lower ball end of the shocks. Extremely light, these parts lower stiction in the ball end and allow free movement. These parts come standard on the Inferno MP9, but can also be used to lower overall weight on Kyosho MP777, ST-RR, and MP7.5 vehicles equipped with Kyosho Big Bore Shocks. .