High quality polycarbonate plastic gives this cutting pad a see-through quality, making die-cutting quick and easy. Simply sandwich the die and material to be cut between a pair of cutting pads and roll through the machine.All Sizzix Cutting Pads are meant to be used on both sides. When both sides of the cutting pad are worn out, it is time for a replacement cutting pad. Use a pair (sold together) of 13" Sidekick Cutting Pads. These thick acrylic Cutting Pads create a "Sidekick Sandwich" for easy die-cutting with Sizzlits Decorative Strips or instant embossing with specially formatted Simple Impressions Sidekick Folders.