The product is a lot of 2 Samsung 2Rx4 PC2-5300P-555-12-L0 RAM modules, each with a capacity of 2GB. These DDR2 SDRAM DIMM modules have a total capacity of 4GB and a bus speed of PC2-5300 (DDR2-667). They are designed for server use and feature ECC memory, making them suitable for enterprise networking and server applications. The lot includes 1 module, making it a convenient option for expanding server memory capacity.