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I purchased these laminating pouches along with other laminating pouch sizes and a thermal laminator for my wife's retail business so they can laminate both large and small items, tags and signage for their merchandising displays. I'd recommend that you write the thickness (3 mil, 4 mil or 5 mil) on the box so that it is quick and easy to identify the correct heat setting for your thermal laminator. Overall, these laminating pouches provide a great way to laminate smaller items such as coupons or business cards.
I used an iron to seal mine. I put a tea towel over it, I had it on the cotton setting, and pressed it for a minute. It worked great! I tested it first on a scrap of paper! I might buy the actual sealer machine, but it was not necessary!
I was skeptical about these little guys, not fully knowing if a business card would actually fit and then, have enough room left over to seal the package. The answer is YES, yes it does... however, the card must be placed precisely in the middle of the plastic pouch, pushed tightly against the seam. The pouch (seam side first) goes into laminator otherwise, you'll have a mess on your hands. I heard that the Fellows brand is at a better price.... but don't know how well they work. For now, I know these little puppies do an excellent job and I'm happy with them.