The Kershaw Scallion Knives were designed by custom knife maker and innovator Ken Onion. The Kershaw Scallions have the patented Ken Onion Speed-Safe assisted opening mechanism. Speed-Safe is a torsion bar system that assists the blade to an open position, when activated by a push on the thumb stud, or the Index-Open blade extension. The Kershaw Scallion knives are offered with black injection-molded Polyamide handles, stainless steel handles and aluminum handles.