Automotive Accessories > Chartpak Chartpak rub on letters and numbers rub on art letter transfers script style black Rub-On Art Letter Transfers are fully acid- and lignin-free and can be applied to paper wood tile ceramic glass and more. Chartpak rub on letters and numbers rub on art letter transfers script style gold Rub-On Art Letter Transfers are fully acid- and lignin-free and can be applied to paper wood tile ceramic glass and more.