This base is designed to hold 25mm RFID tags -- such as the popular NTAG215 round sticker type.
They are designed with a Legend of Zelda Triforce theme on one side and with a flat area on the opposite side where you'll stick the RFID tag.
I wanted them to be compact and easy to store. They can also stack on top of each other with a small recessed lip on one side that locks into the rim on the other.
This is a very easy print with no special needs.
The print orientation should be with the triforce face down.