Your artwork is mounted by hinging the print onto a natural white window mount. The window mount is available in a selection of cut-out styles, which you can find in the product design window.
Selecting the full page layout (no white borders) in the designer will result in your image sitting edge-to-edge inside the frame. No window mount will be fitted.
The mounted print is then set back in the frame by using white spacers to separate the mount from the glazing by 40 mm.