The Smacdown .500 Pro has the best Stiffness to weight ratio on a TRUE 1/2 Bar on the Market today. The Smacdown .500 PRO is made with 100% ULTRA High and Ultra high Modulus Pitch Fiber. The Smacdown 500 Pro is 20% stiffer than the Smacdown 500 and it is stiffer than all Carbon bars on the market ranging from .500 OD to .590 OD. It is even stiffer than many competitors 5/8 bars. Unlike many bars that call themselves 1/2" this one you can put a Micrometer on and Know that it is, what we say it is. The Smacdown .500 Pro uses a unique composite dampening material called SMACWRAP®. Smac is the ULTIMATE in Vibration Dampening and shot Recovery. We are the first to utilize this technology in Archery Stabilization!! If you want the BEST 1/2 Bar on the Market today the Smacdown Pro .500 is it!