How to Use? Step1: Put the paper into the yellow gear gap. Step2: Turn the left and right knobs, if you want to make deeper corrugated texture on paper, you can turn a few more times back and forth. Step3: Takeout the paper and finish the indentation. Tip: We check every product carefully before shipped out, but sometimes it may be damaged on the shipping way. We are sorry for this and hope you can contact us and send the damaged product picture. We will give you a satisfactory solution.