World Champion ACER Racing Ceramic Ball Bearing Kit for the Tamiya TRF416. Comes with the following sizes of Ceramic Nitride Pro Series ceramic bearings:

4 pcs 10x15mm ceramic bearings
8 pcs 5x10mm ceramic bearings
2 pcs 4x8mm flanged ceramic bearings
2 pcs 5x8mm ceramic bearings

Oiled, not greased, with 100% synthetic SIN oil for super smooth and fast action. Uses lightweight diamond polished silicon nitride ceramic balls. Feel the difference and race faster, longer with these lightweight, fast and extremely durable ceramic bearings.

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