This is a bearing kit by Avid RC for the Traxxas Slash 4x4 and models based off of the same frame (e.g. Rally, Telluride).

Bearing Locations

Bearing Kit Fits

Slash 4X4 (#6808L)
Slash 4X4 Platinum (#6804R)
Slash 4X4 Ultimate (#6807L)
Rally (#7407)
Telluride 4X4 (#67044)