This product is a lot of 4 Western Digital Black 2TB WD2002FAEX hard drives, designed for use with PCs. These drives have a rotation speed of 7200 RPM and a storage capacity of 2TB each. They are SATA III interface drives with a cache size of 64 MB, ideal for high-performance storage needs. The Western Digital Caviar Black product line ensures reliability and consistency in handling large amounts of data for internal desktop use.