The product is a lot of 10 Samsung 4GB 2Rx8 PC3-10600S laptop memory RAM modules. Each module has a capacity of 4GB, with a total capacity of 40GB for all 10 modules. These SO-DIMM modules have a bus speed of PC3-10600 (DDR3-1333), making them compatible with laptops that require this type of memory. Perfect for upgrading or replacing existing RAM modules in laptops to improve performance and multitasking capabilities.