These one's look like they may be Ritek 40x but it's hard to say.
I only know 2 factories that actually sell their products as "a" grade to their customers (NOT to say that other factories DON'T have them, they just don't make a big deal about it) and they are Prodisc and Ritek. And if these are Ritek or Prodisc 40x, they would be good. The fact is, it's oging to be a gamble, no matter what, especially since they don't give you much info to work with! http://www.cd-rmedia.co.uk/cgi-bin2/cdrmedia/details.pl?id=v24xsp
These CD-Rs are made by Mitsubishi Chemicals Corp. and are of good quality. YOu pay a little bit more for them, but you get what you pay for! They are much less risky then the unbranded ones above! the only time I wouldn't suggest these is if you have an older LiteON CD-Writer, i.e. the 32x model or earlier
If you don't mind the extra cost, go for the Mitsubishi CHemicals CD-Rs, if you want to try to get a bargain, then the unbranded ones might be a good option. No guarentees of course! but Mitsubishi Chemicals DOES have a good reputation!
Good luck! and let us know how things turn out!