Genuine A-Tech Brand MemoryBlue series memory modules utilize only the highest grade chips from the major manufacturers and A-Tech Branded chips.8GB Kit 2x 4GB DDR3 PC3-8500 LAPTOP Memory Modules (204-pin SO-DIMM, 1066MHz) Genuine A-Tech Brand Blue SeriesModule Size: 4GBKit: 2 x 4GB SticksCertified compatible with the following models.iMac, and MacBook Pro.Model Year: Early 2009 Mid 2009 Mid 2010Apple Order Number:BTO/CTO MB418LL/A MB419LL/A MB420LL/A MB417LL/A MB604LL/A MC015LL/A MC118LL/A MB985LL/A MC226LL/A MC227LL/A MB986LL/A MC371LL/A MC372LL/A MC024LL/A MC373LL/AApple Model No:A1224 A1225 A1286 A1297Apple Model ID:iMac9,1 MacBookPro5,2 MacBookPro5,3 MacBookPro5,4 MacBookPro6,1 MacBookPro6,2We cannot guarantee compatibility of this product past the models stated in the listings. This is a unique product tested specifically for these model numbers.The best way to verify what you need is to obtain these identifiers from the apple site by entering in your serial number in their tech specs search.A-Tech is one of the most trusted names in Premium Memory. Backed by a Lifetime Warranty and 5 star customer support, A-Tech has you covered! Memory upgrades have never been easier. Designed specifically to help your computer run faster and smoother, an A-Tech memory upgrade is one of the fastest, most affordable, and easiest ways to improve your system's performance. A-Tech memory empowers your computer to achieve faster loading times, system responsiveness, and increased ability to multitask and handle data-intensive programs. A-Tech modules are rigorously tested to ensure that your memory meets our stringent compatibility and performance standards. Every A-Tech ram module is tested for complete functionality before it leaves our doors. Give your computer the best, trust A-Tech!