One of best expandable broadheads for over 10 years just got better! Bowhunters have long considered the NAP Spitfire the ultimate expandable broadhead. Its precision tolerances and patented snap-lock blade retention system (no O-rings or rubber bands) put it head and shoulders above the competition. For 2010, there is a next-generation Spitfire, the new NAP Spitfire Edge. This new Spitfire features the Exclusive NAP BONE SAW technology blades that open the way for unprecedented penetration. The dual action serrated blades slices clean through hide and flesh and saws through bone. The Spitfire Edge, is designed to do exactly just that, Give you an EDGE! Upon impact, the NAP Spitfire Edge cuts flesh clean and the patented serrations saw through bone for maximum penetration and knock down. Three razor-sharp NAP super-strong stainless steel DIAMIZE® expandable off-set blades open smooth to a devastating 1-3/4 cutting diameter that produce massive entry and exit holes. NAP's new Spitfire Edge offers perfect arrow flight, pinpoint accuracy and produces large blood trails. Boosting the arrow flight and accuracy of the new NAP Spitfire Edge is a unique, micro-grooved ferrule. That special surface serves to stabilize airflow over the broadhead during flight, amplifying arrow stability and improving accuracy. The blade thickness is 0.030 with sharpness you come to expect from New Archery Products.