TRB RC Wheel, Hub Ball Bearing Set with Blue Rubber Seals Compatible with Traxxas X-Maxx with RPM Hubs.
Note: You Must Have Upgraded Your X-Maxx With RPM Hub Carriers to Use This Kit.

Includes:

4ea 15x24x5mm 6802-2RS-BU
4ea 20x32x7mm 6804-2RS-BU

8 Ball Bearings Total

Chromium Steel 52100 (GCr15) ABEC 3 Races
Hard Chrome GCr15 Balls
Rubber Seals to Help Fight Dirt