Traxxas 5119A ball bearings (10×15×4 mm) are precision steel bearings designed for use in compatible Traxxas RC vehicles to reduce friction and allow smooth rotation of shafts, axles, and gears. Sized at 10 mm inner diameter, 15 mm outer diameter, and 4 mm width, these bearings help improve drivetrain efficiency, enhance performance, and extend the life of moving parts by providing reliable, low‑resistance movement in high‑speed or high‑load applications.