The product is a lot of 2 Transcend TS512MSK64W6H 4GB DDR3L 1600 SODIMM memory modules. These modules have a total capacity of 8GB, with each module providing 4GB of memory. The SO-DIMM form factor and DDR3 SDRAM type make them suitable for use in various computing devices. With a bus speed of PC3-12800 (DDR3-1600) and 204 pins, these modules offer reliable performance for enhancing the speed and efficiency of your computer's memory capacity.