The Corsair Vengeance 16GB DDR3 1866MHz memory kit includes four 4GB modules, providing a total capacity of 16GB. This high-quality RAM is designed for performance and reliability, with a bus speed of 1866MHz for faster data transfers. Made in the United States by the reputable brand Corsair, this memory kit is ideal for upgrading your computer's memory capacity for increased speed and efficiency in various tasks. It is a great choice for users looking to enhance their system's performance and multitasking capabilities.