Micron 4GB PC3-10600 DDR3-1333MHz ECC Registered w/ Parity CL9 240-Pin DIMM Very Low Profile (VLP) Single Rank Memory Module (MT18JDF51272PZ-1G4D1AD). 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.