Ronin Gear"s new #220 Practice Butterfly knife features a 1.25 inch thick, rounded, perforated dull blade (blade cannot be sharpened!) that is ideal for safe training! High quality metal construction with optimal weight and balance. 5 inch closed, 4 inch blade. Legal under most state & local laws as it is a "training replica" and cannot be made into functional knife. CANNOT BE SHARPENED! Black slotted handles.CAUTION: Always train under proper supervision. NOT designed for contact training!