This is the optional Mugen Seiki Steel Pillow Balls. These are a tuning option and can replace the stock aluminum pillow balls. They will help to improve the steering and handling in bumpy and low traction conditions. Each part is 5.4 grams heavier than the stock parts. There are 2 pillar balls per package.
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Steel Pillow balls
I would say unbreakable. Great quality.
