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materials that can be engraved: smooth, organic, opaque, and do not contain flame retardant materials; such as: wood, gray cardboard, bamboo, leather, ivory, flammable plastic, painted pcda, etc., some transparent mobile phones shell (there is a whiteboard pen in our accessories, you need to apply a transparent mobile phone case to better focus the engraving, and then erase the whiteboard pen after engraving)