My set that is pictured there is a 9mm set. If you have both guns together and they're matching they're definitely worth more than a single G23 and G27 separately. I paid about $150-$200 premium over what a pair of these guns were worth at the time. They are NIB too, though. I'd say as time goes buy, they are harder to find in NIB and together, so the premium for having an unbroken and/or unfired set should go up exponentially compared to a broken or fired set.