The product is a mixed lot of 12 DDR3-1600 PC3-12800U 240-pin DIMM UDIMM RAM modules with a total capacity of 84GB. Each module has a different capacity, and the brand, model, and specific module capacities are mixed. These RAM modules are designed for high performance in computer systems that require DDR3 SDRAM memory technology. With a bus speed of PC3-12800U (DDR3-1600), these modules offer reliable and efficient memory support for various computing needs.