I am simply amazed at the engineering of this little circle edge punch! I have had the starter set since it launched on HSN, and I just love using all three of those cartridges to make all sorts of crafts. I was thrilled to find that Amazon was offering additional cartridges for sale and immediately ordered them. I just tried out the Wavy Stripe punch this afternoon to make a doily for a 9-inch, two-layer cake I whipped up. I used the punch on parchment paper and was at first a little concerned I might have some trouble with advancing the paper, since it's so thin and slick. However, that magnet is so strong and the gears so precise, I had no trouble at all. In less than five minutes, I had a perfect 11-inch doily. I'll keep buying new cartridges as they appear, since I'm totally addicted to these punches! Thank you, Martha Stewart!