The Crucial 8GB Kit of DDR3 SODIMM memory includes two 4GB modules designed for Mac computers. These DDR3 SDRAM modules have a 204 pins and a total capacity of 8GB, making them ideal for upgrading or replacing existing memory modules in laptops. With a bus speed of PC3-8500 (DDR3-1066), these memory modules offer fast and reliable performance for improved system speed and responsiveness. Made in China, this memory kit is a dependable choice for enhancing your Mac's memory capacity.