Helix 695mm Carbon Fiber Blades by Nick Maxwell    

14mm root

Remember these are hand made performance blades and like any other custom hand made product will be subject to small blemishes in the finish etc. From Nick Maxwell
"Here you can see what the tip actually does shape wise, and also you can see even the airfoil is highly unconventional with a lot of reflex.
In the tip you notice the ENTIRE blade sweeps forward as a constant cord, then sweeps back- not to a lagging position but in line with the orginal pivot position at the root.
The blade is specifically set-up to benifit from these unique features, take advantage of what these changes do, yet still perform with a natural feel that we are used to in a typical heli blade."