Skeleton Keys lot of 10

These skeleton keys are perfect for any variety of projects.  There is a stamp on one of them that looks kind of like a funnly-looking 3 and a 5.  I am not familiar with this sort of thing, so I don't really if that is important to know. 

I am no expert, but am happy to answer any questions to the best of my ability.

We are a non-smoking, no indoor pets, clean household.

Thanks!!!