The product is a lot of 3 Kingston 4GB 1Rx8 PC3-12800U-11-12-A1 desktop RAM modules. Each module has a total capacity of 4GB, with a bus speed of PC3-12800U (DDR3-1600) and a form factor of UDIMM. These DDR3 SDRAM modules have 240 pins and are designed for non-ECC memory features. Made in China, these modules are ideal for upgrading the RAM capacity in desktop computers.