They look pretty solid. Though 'if' it matters to you, not noted for being particularly efficient, ~99%@50um.
I'll say this though, if this was an M&H Puro filter, likely would have already been thrashed for that excess potting/(glue) in the dome endcap. Not that it likely makes a difference in function imo. Just sayin.
So Mobis makes all of these? Or some M&H? Mahle makes the H/K OEM cartridges in S Korea.
Thanks for c&p pics.