Material: This is made from high quality of Eco-environment PVC material Printing ink was certified by TüV Adhesive ; 3M Adhesive without harmful material Apply for different lapotop and destop model Size of each key: 1.3cm (long)*1.1cm (width) The sticker background is Transparent, So keys color is your keyboard color when you sticker. but the Korean Alphabet is colors like discreption. Korean Keyboard Stickers Transparent Background White Letters Material: This is made from high quality of Eco-environment PVC material Printing ink was certified by TüV Adhesive ; 3M Adhesive without harmful material