This is a one size outer plastic snap together holder; it is the black inner section that comes in many different sizes. This allows you to keep different sized coins all together, in holders that are the same size. The system is the Quadrum Capsules system and the holders come in different coin sizes. We have some capsule holders with different sizes, available for you to purchase on our website. Here we offer a pack of 10 holders for the one ounce Krugerrand.