This product is a lot of 9 Hynix DDR4 SDRAM laptop RAM modules, each with a total capacity of 16 GB and a capacity per module of 16 GB. They have a frequency of 2666MHz and a bus speed of PC4-21300. The RAM modules have a 260-pin SO-DIMM form factor and are non-ECC unbuffered with a voltage of 1.2V