This product is a set of 4 memory sticks with a total capacity of 8GB, each stick having a capacity of 2GB. They are Nanya brand DDR2 SDRAM modules designed for desktop computers, with a form factor of UDIMM and a bus speed of PC2-6400 (DDR2-800). These memory sticks are not altered or custom bundled and have 240 pins for compatibility with standard DDR2 memory slots. This lot of RAM memory is a reliable choice for upgrading or replacing existing memory modules in a computer system.