hub bearing replacement

I want to replace the loose bearings in my halo combat wheels http://halorims.co.uk/products-details.php?id=HUHACR6K&type=mtb&c=J. Their website says they are standard loose bearings. Are all bearing balls the same size?
If not, what is "standard size"?
What is the best grease to pack them in?
If not, what is "standard size"?
What is the best grease to pack them in?
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There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools