The product is a pair of Hynix 512MB DDR 400MHz CL3 PC3200U-30330 RAM modules, providing a total capacity of 1024 MB. These DIMM modules are designed for DDR1 SDRAM memory slots and have a bus speed of PC-3200 (DDR-400). Each module is non-ECC and comes with a lifetime manufacturer warranty. Made in Korea, Republic of, these RAM modules are reliable and high-quality components for improving the performance of your computer.