This is a Viking 1GB 1Rx8 PC2-5300Z-555-13-ZZ DIMM Memory Module. Its Viking model number is V15VR287218FBWA1. These modules were pulled from working systems, cleaned, tested, and packaged for sale. Please keep in mind that these are used memory modules and may show some signs of normal wear and tear. We are guaranteeing them as working for 30 days from the date of purchase.