This standard Davson Quartet 300 character assortment provides the per alphabet letter count that our research shows satisfies most message requirements. Characters are individually sorted in a plastic compartment tray with a sturdy cardboard box. For indoor or outdoor use. Used with any standard 1/4" grooved changeable letter board. Each character has precision molded tabs to firmly grip the letter board surface. Available in three easy-to-read styles in sizes ranging from 1/2" to 3". Supply shortages persist. Allow additional time when ordering.