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) Mean Lean combines a measure of the low friction surface of Xtreme with a measure of the conformability of Supreme V to provide an economical DuraStripe option for appropriate environments.