The latest computer design especially manufactured for the Arrow shaft. These sculling blades which are designed to fit on the smaller shafts, features thin edges, low wind resistance, 3D curvature and hydrodynamic efficiency which gives good lockup in the water but is still clean on entry and exit. Croker blades have been known for cleanliness and these new blades take it one step further. Note: This blade is only available on the S39 Series of Arrow Shafts.