Armour-Piercing (AP) projectiles constitute a major threat to be considered for the design of bi-layer-armour configurations constructed using a ceramic front plate backed with a composite/metal layer. When they are not made of tungsten-carbide the cores of these projectiles are made of hard steel. and are the main part that defines the penetration performance of the projectile. However. https://thebrickes.shop/product-category/wood-markers/