Made of solid brass. Reusable interlocking and interchangeable. Includes 1 each A thru Z, spacer, beginner, period ender, period, comma, and dash. No. 10323: Character Height: 1", Material: Solid Brass No. 10325: Character Height: 2", Material: Solid Brass No. 10327: Character Height: 3", Material: Solid Brass