★The five lengths of spacer in this set will be mightily useful in customizing and upgrading your Mini 4WD car! ★They are given a black anodized finish that will suit them to use with a range of body and chassis colors. ★Examples of use include on rollers, rear stay, brake and more. ★Contains 2 of each length. ★Inner diameter: 2.1mm, outer diameter: 4mm.