The Maxell DVDs are 8x, can be MIT or MIJ. The picture says 4x, but I have not seen 4x for some months. I have never seen 16x. If MIJ, they are made by Maxell (sometimes by TY) and are very good.
The 20-pack color Maxell CD-R with slim jewell cases tends to be MIJ, and if MIJ, they are TY, very good. Walgreens, Best Buy and Staples have the red Sony 30-pack CD-R spindle which, if MIJ, is TY, very good.
In all cases check that they are MIJ.