The product is a set of four Hynix 8GB DDR3 SDRAM modules with a total capacity of 32GB. These DIMM modules have a speed of 1333 MHz and are designed for the Apple Mac Pro 4,1 2009 and 5,1 2010 models. The memory features ECC error correction, making it suitable for high-performance computing tasks. This memory upgrade can help improve the speed and overall performance of a computer, especially for users who require reliable and error-free memory operation.