You can mix and match any letters of the same size and color in a pack (or any digits of the same size and color). You cannot mix letters with digits or mix different colors of “letters” to create a pack. When ordering, please detail: 5x Letter: A, 8x Letter: C, etc. OR 6x # 1, 8x #0. Etc. Keep in mind that 16, is 1x #1 and 1x #6 (= 2 digits). Supreme V is the 5th generation of the original DuraStripe. It is the most versatile version available in that it combines durability and surface conformability to work in the broadest range of facilities with the broadest range of flooring conditions.