661-6134 SDRAM, 4GB, DDR3-1333, SO-DIMM - 21.5inch iMac Late 2011 - A1311

Apple 661-6134 SDRAM, 4GB, DDR3-1333, SO-DIMM - 21.5inch iMac Late 2011 - A1311. 661-6134 for A1311 21.5inch i3 3.1GHz Late 11. Apple Memory for iMac (21.5-inch Late 2011).