Are these coasters printed on a thin rubber type substrate? Like a thin mouse pad, except round & coaster size?

Do you need a pic/scan of my chip, or can you work with a chip scan that resides on the ChipGuide?

I assume you can do coasters with any picture that you crop to a circle? Like a picture of my dog, or something? (Not really considering my dog, but you get the idea.)

These look pretty neat! I remember something similar a few years back, except it was printing chips on round mouse pads.

I may order a few. Need to decide which ones.