World Champion ACER Racing Ceramic Ball Bearing Kit for the Kyosho ST-RR and ST-RR Evo. Comes with the following ball bearings:

18 pc 8x16x5mm ceramic ball bearings

4 pc 6x10mm ceramic ball bearings

2 pc 5x10mm clutch 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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