The M4WD-04/BK is a single-piece 6mm mass damper ball made as a spare for 1/32 Mini 4WD assemblies that use a spherical mass element. The black colouring helps when sorting spares and keeps your parts kit coherent.
It installs into mass damper mounts built for a 6mm ball and is intended for maintenance, service swaps, or restoration projects where a removable mass element is required. The text describes fit and interface rather than chassis tuning.
Buyers should confirm the receiving damper cage or post accepts a 6mm sphere and that any retaining clip profile matches the ball. This is a small consumable aimed at hobbyists and collectors keeping spares on hand.
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