The product is a set of four IBM Ultrastar DDYS-T36950 36.7GB 10000RPM SCSI 3.5in hard drives & caddies. These internal desktop drives are designed for use with PCs and offer a storage capacity of 36GB each. With a rotation speed of 10000 RPM and a cache of 4 MB, these silver hard drives from the Ultrastar product line provide reliable storage solutions for computers and networking systems. The SCSI interface ensures efficient data transfer, making these drives a high-quality choice for storage needs.