I purchased these markers to write children's names on felt Pumpkin trick or treat bags. The markers are ok, I am somewhat disappoined that it really does not get very puffy, not what I had hoped. I tried first with a very hot blow dryer, ( doesn't work ) , so I purchased a heat tool. The marker does puff up, but you can only tell when you feel the writing, you cannot tell by looking. ( It doesn' t appear puffy.) The ink is also very loose, so you can't really make your writing heavier or thicker to adjust the puffyness.