This is the Essentials* bearing kit by Avid RC for the Team Associated B6.3 / B6.3D Essentials.
*The Essentials kit removes the bearings that don't typically need replacing such as the (8) 3x7x3 steering rack bearings and the (2) 5x8x2.5 bearings in the ball diff. You can always make a custom kit by shopping for the bearings individually but the Essentials kit quickly saves you money.
B6.3 / B6.3D | Essentials