Would I buy again, which I did. Easy to use. 15 ounce work on 12 ounce stud mugs. 12 oz will likely work on 15 oz mugs if the image fits under the silicone area. Blown paper is a must. And if using 15 oz on a 12 oz mug, make sure the blown paper is wider than the mug to protect the silicone from transferring. (I have a line on my silicone because I didn't). I use special silicone tongs and a kitchen glove to remove them in case the ink is toxic.
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