The M4WD-39/RE is a compact 9g cuboid mass damper intended for placement on Tamiya Mini 4WD chassis where a predictable block-style ballast is required. It is specified as a straightforward mass element rather than a drivetrain or structural upgrade, and is aimed at tuners who require repeatable small weight increments.
The rectangular form factor delivers a stable centre of mass, simplifying calculations when shifting mass fore or aft. The nominal 9g rating is appropriate for incremental tuning and for installations where a flat profile is needed. No specialised mounting hardware is assumed; the part is compatible with common attachment methods used on spare parts of this type.
Usage notes restrict the component to a spare mass role on Tamiya Mini 4WD platforms. Users should verify chassis clearance and attachment method before final installation; this product is intended for experienced hobbyists and tuners managing balance and mass distribution.