Gemini Junior Accessories - Plastic Shim Add an extra layer in between your cutting plates by using the Plastic Shim for the Gemini Junior. Shims are used in die-cutting to make the cutting-plate-die-paper-cutting-plate sandwich a little bit thicker. This helps to get an even more precise cut from your dies, especially if they are highly detailed or thin. To care for your shim, please flip and rotate after each pass. If the shim does start to bow, flip over and pass through until it is flat again, then continue to flip and rotate as normal.  For more information, please visit our FAQ page.