The product is a set of 2 SK Hynix DDR4 2666V ECC RDIMM modules with a total capacity of 64GB. Each module has a capacity of 32GB, and they are designed for high performance with a bus speed of PC4-21300 (DDR4-2666). The modules also feature ECC memory, which is a type of memory that can detect and correct errors for improved reliability and performance. Perfect for those looking to upgrade their computer's memory capacity and ensure data accuracy.