These characters are manufactured with plastic-coated cloth and pressure-sensitive adhesive, which is designed to stick to any clean, dry, indoor surface. Letter Labels Kit, Character 0 Thru 9, Character Height 1 In., Color Black/Yellow, Material Vinyl, Number of Cards 25, 10 Markers per Card, Overall Height 1-1/2 In., Overall Width 7/8 In., Standards ASTM B 117; ASTM D 1000; ASTM D 2979; ASTM G 155; UL Recognized, Package Quantity 25