With a gentle slide of the thumb, the metal plate held in hand split into three pieces.
"The first layer is case-hardened steel that is repeatedly infused with carbon during the quenching process. The resulting steel is not only white and shiny but also very hard and prone to shattering. When a bullet hits the case-hardened steel, the plate naturally breaks into two, and the bullet loses some of its kinetic energy, with its trajectory disrupted and sent tumbling. Next, the deformed and tumbling bullet will hit the second layer made up of several sheets of paper-thin white copper. Copper is not as hard as steel, but it is much more ductile and tough. The spinning and tumbling bullet will curl up the copper, losing additional kinetic energy and increasing its contact area. Finally, the bullet, its energy depleted and contact area increased, slams into the third layer of energy-absorbing spring steel plates, blown away like a fool walking with an umbrella in a hurricane."
