Because animated banners are not always visible in the Newsletters or are not displayed properly in some mobile devices, and in some email providers, we also need backup, static banners (non animated images) in the same sizes in gif, jpeg or png format. Please therefore supply the static banners in the sizes 728x90, 120x600, 300x250, 300x600, 160x600 in gif, jpeg or png, based on the animated banners.