This M4WD-39/RE cuboid block is a compact 9g mass intended as a simple ballast for Tamiya Mini 4WD cars. It is described as a mass element only, aimed at hobbyists who manage weight distribution on standard 4WD Mini chassis rather than those seeking mechanical upgrades.
The block shape produces a predictable centre of mass, with the 9g nominal mass useful for fine adjustments. It is best suited to spots where a flat, rectangular weight will fit inside the bodywork or chassis trays. The description assumes common spare-part fittings, not specialised mount kits.
Fit guidance is limited to its role as a spare mass for Tamiya Mini 4WD platforms; check chassis clearances and mounting options before installing. Collectors can use the red colour to help identify matching spares.
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