There's not too much to say regarding the product except it's a great price and higher grades aren't necessary

These are the right grade and appear to be of great quality, and the price per bearing in this assortment can't be beat.

Nice shiny top grade steel bearing balls neatly sorted, but the containers are not resealable.

If you want a truly superior grade of ball bearing you can order some grade 5 or 3 ceramic bearings to use in something like a Dura-Ace or a Campagnolo Record hub.