Full Details on Amazon.com : http://www.amazon.com/gp/product/B0031RBHE2?tag=tsukuyomi-20 Macbook Pro 4gb 2 X 2GB DDR3 PC3-8500 (1066Mhz) 204 pin Memory 4GB Upgrade Kit For Mac Book Pro DDR3 1066 Models 2 x 2GB DDR3-1066 PC3-8500 204 PIN