I've used them to cut 1) meat, cheese and bread and 2) Rice Krispie treats. 1 worked fine, but we had to "shake" them on a cutting board to get a clean final cut. 2) was not an ideal use or outcome. I used the smallest, and since it doesn't have a comfortable rubber or silicone grip, my palms and fingers were very sore. Also, the RKTs I cut out were thicker than a cookie cutter, so I had to get really creative with how to go through them.
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