You will receive two sticks of Samsung laptop memory.
Photos for reference only.
Apple iMac
Intel Core 2 Duo / i5 / i7 (DDR3 Version)
20" (2.66GHz)
21.5" (3.06GHz, 3.33GHz)
24" (2.66GHz, 2.93GHz, 3.06GHz)
27" (2.66GHz, 2.8GHz, 3.2GHz, 3.46