DDR3 1066MHz PC3-8500 204-Pin Unbuffered Non ECC 1.5V CL7 Dual Rank 2Rx8 based 256x8 Module Size: 4GB Package: 2x4GB Guaranteed – Lifetime warranty from Purchase Date Free technical support Designed for Apple MacBook - 13 inch Late 2008, 13 inch Late 2009 , 13 inch Mid 2010 - MacBook5,1 MacBook6,1 MacBook7,1 Designed for Apple MacBook Pro -15 inch Late 2008, 17 inch Early 2009, 13 inch / 15 inch / 17 inch Mid 2009, 13 inch / 15 inch / 17 inch Mid 2010 - MacBookPro5,1 MacBookPro5,2 MacBookPro5,3 MacBookPro5,4 MacBookPro5,5 MacBookPro6,1 MacBookPro6,2 MacBookPro7,1 Designed for Apple iMac - 20 inch / 24 inch Early 2009, 20 inch Mid 2009, 21.5 inch / 27 inch Late 2009 - iMac9,1 iMac10,1 iMac11,1 Designed for Apple Mac Mini - Early 2009, Late 2009, Mid 2010 - MacMini3,1 MacMini4,1