The product is a lot of 9 Samsung 4GB 2Rx8 PC3 10600R DDR3 SDRAM memory modules. Each module has a form factor of DIMM and a bus speed of PC3-10600R (DDR3-1333). These memory modules are ideal for upgrading or replacing existing RAM modules in computers that require DDR3 memory technology. Samsung, being a reputable brand, ensures quality and reliable performance for the system. These memory modules are a great choice for improving the performance and efficiency of a computer.