RAM & Memory Upgrades
OWC - 16GB OWC Memory Upgrade Kit - 2 x 8GB PC12800 DDR3L 1600MHz SO-DIMMs for 2011-2015 iMac, 2011-12 Mac mini, and 2011-2012 MacBook Pro (non-Retina display) models
Technology: DDR3L SO-DIMM Data Rate: DDR3L-1600 Pin Count: 204-pin
https://www.bizrate.co.uk/ram_memoryupgrades/owc-16gb-owc-memory-upgrade-oid6611295027.html