The IBM 4mm Data Cartridge is a high-quality cassette designed for data storage. With a capacity of 20GB per cartridge, this lot of 6 cartridges offers a total storage capacity of 120GB. These recordable cartridges are ideal for use in IBM 4mm tape drives, providing reliable and efficient storage solutions for various data backup and archiving needs. With the trusted IBM brand behind it, you can be confident in the durability and performance of these data cartridges.