A Backer Insert is a sheet of gorgeous Shimmer paper that goes underneath the invitation card in the Pocket folder and Elegance kits. Inserts come in a variety of colors and have the effect of creating a beautiful background to your invitation card and also introducing another color if needed. You can also use the backer inserts and Envelope inserts to create a matching and modern feel to your invitation. For example, when you add a gold backer insert to the Bronze shimmer or Burgundy pocket folder or elegance kit, the effect is amazing! Backer inserts are sold in packs of 20.