This pack of Verbatim Corporation's M-Disc BD-R features 25 units of 100GB storage capacity with a 4X writing speed. The discs are specifically designed for long-term data archival, with a projected lifespan of up to 1000 years. They come in a spindle and are white inkjet/hub printable. Ideal for professionals and individuals who need reliable and durable storage media, these Blu-ray BD-R discs provide ample space for backup, archival, and distribution of large data files. With their advanced technology and high-quality construction, you can rest assured that your data is safe, secure, and accessible for many years to come.