This G.SKILL 4GB memory kit includes two 2GB DDR3 SDRAM modules, with a total capacity of 4GB. The memory has a bus speed of PC3-10600 (DDR3-1333) and features a form factor of DIMM with 240 pins. It is ideal for upgrading the memory of your computer and improving its performance. The model number of the memory kit is F3-10666CL9D-4GBECO and it comes with a unit quantity of 2. This memory kit is suitable for use in a variety of computers and is compatible with most systems. It is a high-quality product from G.SKILL and is perfect for those looking to upgrade their computer's memory. Whether you are a gamer or a professional, this memory kit will provide you with the performance you need.