700MB capacity, 2-52x speed CD-R, 50-disc spindle pack. - Type: CD-R - Capacity: 700MB - Speed: 2-52x - Quantity: 50 discs - Package: Spindle pack Unused, dead stock stored for over 15 years. These are the infamous Princo "SuperX" 50-disc spindle CD-R media. The phthalocyanine used as a light-resistant agent is very thin, so thin that you can see through the disc when held up to a light source, earning it the nickname "thin phthalo." Due to this thinness, it is vulnerable to light, and the data written on it becomes unreadable within a few years. Users nicknamed it the "vanishing ball" CD-R. The faster the writing speed, the shorter the lifespan of the data tends to be, but be aware that writing too fast may result in "underbaked" discs depending on the drive compatibility. Princo CD-R media is no longer available, making this a rare product. Since the written data will become unreadable within a few years, how about using it for negative purposes such as not wanting to leave data for the recipient, wanting to bury the data in the dark, or for YouTube content? Please understand that this is dead stock stored for over 15 years and has poor light resistance before making a purchase.