small round tabs hanging from tubs

In alot of the vids you see online. People have little round tabs on the tubs. What info do they usually put on thoes?

They are probably ID tags that the breeders use to label each snake. For example: If you had two pied females and one pied male in a clutch, you might use an alphanumeric designation for each snake containing the year hatched, morph, sex, and serial number. So they might look something like this: 10-PD-F-01, 10-PD-F-02, and 10-PD-M-01...

Our males get the little circle tabs. Their name, sex, year born and morph is the info we put on them... Hope this helps and I'm sure there are a bunch of different methods!