Comes in the following combination:
For iMac 21.5" & 27"
8GB kit (4GB x 2pcs)
16Gb kit (4GB x 4pcs)
For iMac 27" ID 11.3 with Intel CORE i7 processor only (32GB maximum upgrade). If your iMac 27" Mid 2010 but an Intel Core i3 3.2Ghz this model cannot be installed with 32GB memory.
32GB kit (8GB x 4pcs)
PC3-10600 DDR3 1333MHz SO-DIMM 204 Pin CL9 SO-DIMM Memory Upgrade Kit for 21.5" and 27" iMac Models, Mid 2011 Mac mini modelsWarranty: Memory comes with Lifetime warranty.