DESCRIPTION:
Apple MacBook Pro Unibody Ram Memory with different capacity of 4GB (2 X 2GB), 8GB (2 X 4GB) , 16GB (2 X 8GB)

depends to what you pick, compatible for 

13" MacBook Pro A1278 ,  2012 model.
15" MacBook Pro A1286 , 2012 model.
17" MacBook Pro A1297 ,  2012 model.

CONDITION:
Premium Part Fully Tested .  

INCLUDES: Ram " Memory " Only.
 
COMPATIBILITY:
MacBook Pro 13" A1278
MacBookPro9,2 Mid 2012: MD101LL/A (2.5 GHz Core i5) 
MacBookPro9,2 Mid 2012: MD102LL/A (2.9 GHz Core i7)

MacBook Pro 15" Unibody A1286
MacBookPro9,1 Mid 2012: MD103LL/A (2.3 GHz Core i7)
MacBookPro9,1 Mid 2012: MD104LL/A (2.6 GHz Core i7)
MacBookPro9,1 Mid 2012: MD104LL/A (2.7 GHz Core i7)