I tested it through some thick paper and an envelope, sliced through like butter. I also tried the card stock it came on which is much thicker than what it is made for, I did have to hold it still as it wanted to slide instead of cut, but did go through it with a nice clean edge. I used to have one of the very large paper cutters like teachers use, so to find this and see how quickly it works it great. Plan on using with kids to make the long ring chains, this will make it much more fun! This would be a great add for scrap bookers