MARK RICHARDS-Crystal Stickers: Elements. Theses tickers are acid free and adhere to virtually any surface. Crystal Elements offers a wide variety of clear stones in various sizes including 2mm; 3mm; and 5mm. The assortment stones include sizes 3mm; 4mm; 5mm and 6mm. These stickers also are available in a variety of shapes; words; designs; alphabets and fashionable colors. Size; color; shape and number of stickers varies by package. Imported.