I thought I put it in the survey question, but it seems I was caught being human!

If you backed for the To Build/Riot collar pins, you'll be asked to choose a size. As previously stated, these are intended to be collar pins and will come with a chain. The options chain length in inches. Choosing 0" will mean getting the pins with no chain. 2 is a 2" chain (good for displaying side by side or on a board), ect ect.

Sorry for the confusion! Hope this helps <3