I' ve found the same as JeffB.

Flex-Fletch are the toughest things around, but you' ll pay a bit more for them. They can handle multiple passthroughs on a target that would' ve made other vanes unuseable. They have execptional resiliency.

Teamed up with their Flex-bond glue, they are one tough combo. Takes more time to fletch them, but worth it in the long run because you don' t have to replace the vanes as much.