Some of the products on our website are labeled Old Design and New Design. The Old Design is considered the design from the previous mold. In terms of the feathers as an example, the Old design tend to have a narrower chain hole. If you were going to attach it to a Large Cornered Chain, Large Round Chain or Small Round Chain, it will not go through the Old designed feather chain hole. So you would have to go with the Small Cornered Chain or Leather Cable. On the other hand the New Design is the latest mold used, which will have a wider chain hole and all chains will go through this designed feather.