The product is a set of four Imation 3M TR-1 Travan-1 Minicartridges, each with a capacity of 400/800MB. These minicartridges were manufactured in 1997 and are designed for use in data storage applications. The Imation brand is known for producing reliable storage media, and this set of cartridges would be suitable for use in a variety of computers and data storage devices.