Mini 4WD cuboid weight 9g M4WD-39/BL by 3Racing  [M4WD-39/BL]

M4WD-39/BL cuboid weight for Mini 4WD chassis tuning

The M4WD-39/BL is supplied as a small black cuboid mass damper with a nominal mass of 9 grams. It is an aftermarket accessory for Mini 4WD bodies and frames where modest, localised weight additions are needed. The unit is bare of mounting fittings, so attachment must be planned around your chosen chassis layout.

Builders tend to use this block to adjust static balance and influence local handling cues rather than to create large performance gains. Its utility depends heavily on chassis geometry, roller placement, and the overall setup philosophy. Use it as part of stepwise tuning rather than as a single solution.

Practical advice: confirm body shell clearance and check that the block will not obstruct rollers or guide stays. Although marketed for Mini 4WD, always confirm fitment on the specific chassis before permanent installation.