Jim this is if you need to replace your colored caps or in my case I remove them out of the large one which I keep to put back into if I sell, and put them into small air tights for a smaller size. Not to put anything other than the special strikes in a smaller size and keep the same color. Once the color caps are scratched,cracked, or broken you cann't get a replacement unless you dye,paint or what ever you can think of.