What kinds of letters are there? Metal: Foundry cast letters, Flat metal cut letters. Fabricated lighted and plain letters All are available in custom paint or metals: Aluminum, stainless steel, brass and copper finishes. Plastics: Heat molded letters, Injection molded letters, Molded lighted letters, Flat cut acrylic, Metal film laminated letters Economy : Painted foam letters Metal laminated flat-cut foams What's the best letter to use for my building, monument sign or inside lobby wall? In the past, letter materials had a lot of impact on the cost of the letters. Today with modern tech and recycling, we've been able to significantly reduce waste so many of the letters are similarly priced and warranted for life with the exception of the lighted letters. So if you want a specific "look", that will determine the materials you order. We're available to answer your questions in basic and detailed technical specificati...