These materials can be cut, etched and engraved:
acrylic, cloth, cork, corian, delrin, fiberglass, leather, 
matte board, melamine, mylar, paper, plastic, pressboard, 
wood, and wood veneer.

These materials can be etched or engraved only:
ceramic, circuit boards, glass, marble, tile, 
and metals (anodized, coated, painted, stainless steel).

Bare metals can be marked on their surface.