This is Yeah Racing RC Ball bearings should always be your first upgrades, it reduces friction for less rolling resistance, and that means higher speed and longer the running times. RC Ball bearings hardly require maintenance and last a lot longer than stock Oilite bushings.
For: Kyosho Mini-Z 4x4
Total Bearing (15 Pcs)
-YB6005M 3mm x 6mm x 2.5mm (6pcs)
-YB6008M 4mm x 7mm x 2.5mm (4pc)
-YB6015M 6mm x 10mm x 3mm (2pcs)
-YB6031M 2mm x 5mm x 2.5mm (3pcs)