TRX-4M Ball Bearing Set.
3x6x2.5 mm (8), 5x8x2.5 mm (4), 4x8x3 mm (4), 8x12x3.5 mm (2), 3.5x7x2.5mm (4).

Replacement part for these models:
1/18 Ford® Bronco®
1/18 Land Rover® Defender®