As far as i know they were meant to match the weight of cedar so you could use them as wood-like (weight and FOC) carbons fpr the tougher training stuff.
Id like to shoot em for that reason, but the price is still to high for me.
Thats alos because they have one issue i dont like:
The outside wall diameter is 11/32", but the insert-collar is tapered, 11/32 on shaft end and 5/16 at tip end. I can see this was meant to make the usage of 5/16 tips possible but i dont like that one bit. If there was a 11/32 collared insert wich one could use with 11/32 tips id have to think again about them....