Its loosely based on the Kramer "Diamond shape" handle, but a bit less angular.
I think this one could get slimmer on the side profiles for my hand. But this is the general idea. Twin ferrule/endcap design, the square is ground down, "on the diamond" with the corners out, and a sweeping taper on both ends, the top sharps are rounded. I think it feels nice and aids a handle grip just infront or further forward with comfort and control. What do you think?
You can pinch grip on the front of the handle