6 Replacement 72 Pin Cartridge Connectors for Nintendo NES 8 bit Systems. This is a third party item, not manufactured by Nintendo. This connector is compatible with the original Nintendo 8 bit NES system ONLY. It is NOT compatible with the Top Loading Nintendo 8 bit System released later, nor with any of the clone NES systems. We do not have any information available about how to install this item in your Nintendo NES 8 bit System, please use your favorite search engine for more information on opening your Nintendo console. This is Brand New item. 30 Day warranty included.