Schumacher U4811 1/8th Silicone Nitride balls (12)
Harder and lighter than standard steel balls.
Note: 1/8th balls for ATOM spur gears.
Use 3mm balls for Supastox spurs.
Demon DB1-8 Steel diff balls 1/8th (3.175mm) Pack of 72 balls
XRay 930130 X1 F1 Carbide diff balls 3.175mm (1/8th) Pack of 12