Crucial 8GB PC3-12800 DDR3-1600MHz non-ECC Unbuffered CL11 240-Pin DIMM 1.35V Low Voltage Memory Module (CT102464BD160B.C16FPR). This is a seller refurbished part in great working condition. May show signs of cosmetic wear but this should not interfere with the effectiveness of the product. Taken from a working environment.