The Hynix 16GB DDR3 RAM kit includes 4 modules of 4GB each, for a total capacity of 16GB. These UDIMM memory modules have a speed of 1333MHz and are designed for high performance in computer systems. The modules are manufactured by Hynix, a reputable brand in the memory industry, and are built to the PC3-10600U-CL9 standard. This RAM kit is a reliable and efficient choice for upgrading the memory capacity of your computer.