The Black Ops Kalaj Kutter Replica Double Daggers are great tools for the beginner, intermediate, or advanced practitioner of defense (/offense) Double Daggers training. These Knives are hand crafted from a solid piece of High Density Poly(no flex like rubber), a high impact strength and high density polyethylene which has excellent tensile, energy absorption, abrasion resistance, water/ salt resistant, and resistance to stress cracks, so you will be sure to enjoy these Kalaj Kutters for years to come.