I use an Xtool S1 Diode and Infrared Laser
Other engravable Materials:
Paper, Wood, Leather, Stainless steel, acrylic, Bamboo, Fabric, Dark glass, Ceramic, Jade, Marble, Shale, Cement, Brick, Plated metal, Painted metal
All Metals (Gold, Silver, Brass, Iron, Aluminum, Stainless Steel, and more), Plastic, and acrylic.