Two original SK hynix 4GB DDR4-2666 SO-DIMM RAM modules, 8GB total. Model HMA851S6CJR6N-VK; labels read 4GB 1Rx16 PC4-2666V-SC0-11.These were factory-installed in my brand-new 2019 iMac and removed immediately to upgrade to more RAM. They were working when removed and have been stored undisturbed in the replacement RAM packaging ever since. You will receive the exact two modules shown in the photo, in the protective packaging pictured. Please verify compatibility with your computer before purchasing.