This is a TKO Special RT 5x13x4mm Losi Inner Clutch Bearing. TKO introduces a proprietary design 5x13x4 bearing for the Losi clutch. These bearings have a higher RPM rating than standard 5x13s and are capable of withstanding high radial and axial loads for much improved performance and life. Developed and tested over the last year there is no other bearing like it for 1/8th scale clutches!
NOTE: The bearing has 2 seals. One Blue and one Black. The Blue seal faces the front of the car.