The DEX210 comes with a ball diff in the kit.
The balls are 3mm, and there are 14 of them.
I've no idea what material they are in the kit though - does anyone know?
We have our really ace ceramic diff balls available now for the 210 at £9 per pack, post free.
http://rclazy.com/blog/2011/09/30/te...ic-diff-balls/