六角ホイールハブとホイールの間に挟むことで、トレッドの微調整をすばやく行うことが出来ます。厚さ0.25mm, 0.5mmの2種類をラインナップ。各8個入り。

By adding these wheel shims between the hex wheel hub and the wheel, you can fine-tune the cars track width quickly. Available in two thicknesses of 0.25mm and 0.5mm. 8pcs are included in each.