Precision bearings, chrome steal inner and outer race. They have chrome steel-balls, and serviceable shields.
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Good bearings but ...
More $$$ goes further. These grade 3(1,3,5,7,9) bearings aren't bad; they're working just fine for my Luminous wheels. However, you can every once in awhile hear the bearings when T stopping. If you're on a budget, these are perfectly fine. But should you have an extra $5-$10, I'd get the grade 7 or 9.