This sheet of stickers in good shape is the perfect compliment to your cards. Made in reflective vinyl, they will light up your correspondence with an extra chic twist. - This is a sheet of stickers made of reflective vinyl, the same material found on life jackets or bike wheels for instance. It shows the light when flashed. Sheet size: A6 (105 x 148 mm/4.1 x 5.8 inches). Each sheet carries 15 individual pre-cut stickers. - This product doesn't come with an envelope. Envelopes used on the product pictures are only a suggestion of use on stationery, to highlight the stickers' use. You can also use it on stationery or any other clean hard surface. These stickers are not made to be removed.