These will most likely be RitekG04's. They aren't so hot on the newer drives but if you have something like a NEC ND2500A or other such drives (Potentially some of those older Lite-On drives) you should be in good shape. That is a good deal especially for Silver Matte discs of decent quality. I hate shiney silver surfaces myself since they mark up and get scratced pretty easily. The 2500A should be able to overspeed these to 8x, I wouldn't suggest taking these discs past that. I know I used them awhile ago on my old NEC ND2500A and they never posed a problem for me, I don't know what the quality is like now with them though.
Thanks for mentioning it Spalding, great deal. If I wouldn't have ordered 200 Prodisc 8x DVD-R's from Rima.com that I have on the way I'd order 200 of these probably. LOL