Description 300mm Circle Window Stickers 300mm Circle Window Stickers come in a range of standard sizes and are perfect for advertising, special offers or promotions. Choose from circles, squares or rectangles, we have window vinyls to suit any space required. Printed on 95mic white removable vinyl these window stickers are perfect for displaying information on the exterior of your windows. Vinyl Window Stickers are face printed on white vinyl and can’t be stuck to the inside of a window and viewed externally.