The product is a set of 4 SK Hynix 2GB 1Rx8 PC3-12800U-11-12-A1 RAM modules. These DDR3 SDRAM DIMMs have a total capacity of 2GB each and a bus speed of PC3-12800U (DDR3-1600). Ideal for upgrading or replacing RAM in compatible systems, these modules offer reliable performance and quality from a reputable brand like SK hynix.