For products that are laser etched, not all artwork is appropriate.
It's important to realise that the laser burns the artwork into the product. This means that the image on the product is created not with ink but with the depth and the colour of the burned material.
Colour images, images without high contrast or images that are not line art, may not have a desirable effect when burned.
When designing for laser etching it's best to stick to text and high contrast line art.