G.Skill FA-8500CL7S-4GBSQ For Apple Series SO-DIMM DDR3 RAM G.Skill 4GB (1x4GB) Single 1066Mhz CL7 1.5V

Brand - G.Skill, Size - 4GB (1x4GB), Channel - Single, Speed - 1066Mhz, Latency - CL7, Voltage - 1.5V, Timing - 7-7-7-20