The Tornado Shaft was designed with speed in mind. It is a high modulus carbon standard diameter shaft (.246 ID), with low grains per inch, for the archer who wants speed without compromising strength. The Tornado is a great shaft for the archer wanting to build FOC and EFOC. This is a perfect shaft for the quick footed Whitetail and speedy Western Pronghorn. For the archer not interested in hunting, the light weight construction will also serve well in reducing pin gap for 3-D shooters alike.