First punch out a scallop with the Stampin' Up! Use Dotto repositionable adhesive on one side of the punched out scallop to adhere it to a piece of copy paper. You must use copy paper as another sheet.
I need to find the measurements. Handy list of measurements needed to create double edged strips with various Martha Stewart edge/border punches and a tutorial different punches including the one in the slideshow tutorial)