In the early days of the Wings, Herpa initially used black inlays with transparent covers. Inside the inlay, foam-like plastic foil was used to protect the models.
Later, transparent inlays with transparent lids were introduced and are still used today. Inside the inlay, transparent plastic foil is used to protect the models.
In 2022/23, isolated models had inlays in varying shades of blue (e.g. 536226 SAS 737-700). This is due to the increased use of recycled material, but is to be avoided in the future.