The product is a set of two 4GB Apacer ECC PC4-21300 DDR4 RAM modules, designed for server use. These DIMM modules have a total capacity of 8GB and each module has 4GB of memory. With a bus speed of PC4-21300 (DDR4-2666) and 288 pins, these memory modules offer reliable and high-performance memory for server applications. The ECC memory feature ensures error correction and prevention of memory corruption, making it ideal for use in professional server environments.