John Wilson Blades - Gold Seal 10" inches to fit boot length 10 1/4" as standard or 10" for a heel to toe fitting. The Gold Seal Parabolic features solid sole plates for increased rigidity and a taper hollow ground, giving increased bite on edges. Rocker : 8 ft. Radius of hollow: 5/16th" Toe Rack Design: Cross cut Blade Type: Taper (side honed)