The product is a lot of 2 Samsung M378B5173BH0-CK0 DDR3 DIMM modules with a total capacity of 12GB (4GBx3). These memory modules are designed for desktop computers and are compatible with DDR3 SDRAM technology. The modules have a form factor of DIMM, with 240 pins and a bus speed of PC3-12800U. Manufactured in China, these high-quality Samsung modules provide reliable and efficient performance for your computer system.