This product is a lot of 20 Seagate 1TB ST1000DM003 7200RPM SATA III 3.5" desktop HDDs with 64MB cache. They are designed to be used in both PC and Mac systems and feature a silver color. The Seagate Barracuda model is known for its high read speed of 500MB/s and comes with features such as temperature sensor, hot swap capability, shock resistance, time machine compatibility, and low noise level. With a storage capacity of 1TB and a form factor of 3.5 inches, these internal desktop drives are reliable and efficient storage solutions for various computing needs.