Also, If it doesn't say 'circular' odds are it's linear: CPLs used to be quite pricey and specialized, not the kind of thing they'd have left people to guess at.
They look like they're decently-made, anyway: I'm a little suspicious of the name, because it was pretty common practice for some cut-rate outfits to try to name their stuff similarly to a major brand, (Like... Nikon?
) But they just look well-made and well-packaged for that to be what's going on here. (Also the price there is just a bit much for a cheapie, by a couple times over, at least.
)