ROYAL LANGNICKEL-Engraving Art. Engraving art is a great way to get the kids started with out the mess. A variety of these kits are available and there is sure to be one perfect for rainy days; camps; fun day at school and much more. This package contains Design Your Own Button: two 2-1/2in clear buttons; 2 2-1/2in die cut engraving circles and an engraving tool. Recommended for children ages 8 and up. WARNING: Choking Hazard-small parts. Not for children under 3 years. Imported.