I don't even know what they are. The ones on my Schwinn are most definitely the original ones that came on the bike. The ones on my Fuji are likely to be original too. So nothing really special.

I should maybe add that I'm quite light for my height (6'1", -140lbs) so maybe I don't need as much stopping power as the next guy. But I do generally carry an excessive amount of heavy stuff with me on the bike or in a trailer FWIW.