Simply align the etched lines on the stencil to an A2 card base for a perfectly centered mask, then use Purple Tape or Pixie Spray (sold separately) to adhere the stencil to your cardstock panel. You can layer the two stencils included in each package together or use them individually, and each comes with the solid shape of the middle of the stencil that easily allows you to reverse mask or apply different colors of ink to your project!