You can use them as a tart. That is fine. Electric is good! No soot or FIRE! That is what scentsy's are too. Scentsy warms the wax with a light bulb. Thanks for looking! Any other questions, please ask.
I made these as samplers. I take it and put the container upside down in my warmer until the wax is melted out of it and then toss the container in the trash. It is the size of a large lip gloss. 1 1/4 wide by 1/2 inch deep.