The product is a lot of 50 16GB 2RX8 PC4-2666-3200 desktop memory module RAM. These DDR4 SDRAM modules have a form factor of UDIMM and a total capacity of 800GB. Each module has a capacity of 8GB, with 288 pins and a bus speed of PC4- (DDR4-2666-3200). These memory modules are compatible with desktop devices and utilize DDR4 ram memory technology for high performance and efficiency in computing tasks. Ideal for upgrading or replacing existing RAM modules in desktop systems, this lot provides ample capacity for enhancing system memory. Modules are tested and working. They came from functioning devices that are being upgraded.