Availability Letters for Letter Board - 1 inch - Set of 350 Different Letters. Helvetica Font Email a friend Question about product? Add to compare list Add to wishlist Details 350 pieces 1" high white plastic letters - Helvetica font - taller than most felt board letters. Made of plastic. These letter board letters can be used on a changeable felt letter board (BOARD NOT INCLUDED) Great to supplement your existing letter board with letters that are larger and with different fonts to present your message better. Always have all the letters you need for you message. Fits virtually all letterboards, with a single row of tabs on back of letter. Use scissors to cut the letters apart.