World Champion ACER Racing Ceramic Ball Bearing Kit for the Team Associated B4.1 or T4.1. Comes with the following:

12 pc 3/16x3/8 ceramic ball bearings

2 pc 10x16x4mm ceramic ball bearings

2 pc 3/16x1/2 ceramic ball bearing

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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