Hynix 512MB PC2-5300 DDR2-667MHz non-ECC Unbuffered CL5 200-Pin SoDimm Single Rank Memory Module( HYMP164S64CP6-Y5 AB-C). This is a seller refurbished part in great working condition. May show signs of cosmetic wear but tghis should not interfere with the effectiveness of the product. Taken from a working environment.