Licensed Kickstart 3.1 for Amiga 500/500+/600/2000. It is a Kickstart 40.063 (Commodore Edition). You need this to use Workbench 3.1 in your Amiga.
You will get one 40 PIN module. You should repleace your old module with new one. It is a specified ROM with label from Cloanto with unique serial number.