anybody seen these yet? the "hd" is 9.25 gpi,has a spine of .275 and it says they use the x nocks.looks like they would be great for efoc arrows being that stiff,fairly light in weight and already weight forward.remember the old quest videos?these are from those guys
http://www.questproductsusa.com/thumper.html
That looks really interesting. I may have some new toys to play around with sooner than I thought.
They are not so new. They are made by Arrow Dynamics as Nitro Stingers.