HP is launching new ink cartridges in Asia Pacific and Oceania that will be compatible with your HP DesignJet printer. The selectability number of these new cartridges will have a letter B at the end. Therefore, you must purchase the same selectability number as you do now, but with a B added at the end. For example, if you have an HP 711 cartridge, from now on it will be HP 711B. Take into account that in order to use these new cartridges you must perform a firmware update.