How much caffeine is in Kimbo espresso?

I'm curious, could you please tell me how much caffeine is typically found in a serving of Kimbo espresso? I've heard that it's quite potent, but I'd like to get a specific idea of the caffeine content before indulging. Is there a standard measurement for the amount of caffeine in Kimbo espresso, or does it vary depending on the brewing method or the specific blend?