parabolic feathers
 

Not sure of the spelling,sorry . how much better are they? were can I get some?

RE: parabolic feathers
 

Parabolic simply refers to the shape of the back end of the feather. They're the rounded back. Don't know as there's a lot of difference in performance, but they are quieter in flight. Probably don't steer the arrow quite as well, but not very noticable.