The product is a lot of 4 Toshiba MG04ACA400N 4TB HDD CMR internal desktop drives. These hard drives are designed for use with PCs and have a storage capacity of 4TB each. They have a form factor of 3.5 inches and a rotation speed of 7200 RPM. The drives are compatible with SATA III interface and are in silver color. With SMART data indicating each drive has had 29-47K hours of usage with no bad sectors, these Toshiba hard drives offer reliable storage solutions for desktop systems.