The 1 inch white letter set is for those who couldn't keep it short and sweet and need extra characters. These letter set can be used on whatever letter board you own, but they come by default on the 12x18 and 16x20 letter boards.
254 (1 inch) letters, numbers, and special characters.
Take note that all letter boards are already inclusive of letter sets. You can order these additional letter sets if you want extra letters with other sizes and colors. :)