What  a simple closed shape in Euclidean geometry, plastic bodied, and designed to damage or destroy a vehicle by blast effect?
Type 72 non-metallic anti-tank mine Type 72 Non-Metallic is a Chinese circular, plastic bodied landmine which is designed to damage or destroy a vehicle by blast effect.
Flak jacket A flak jacket or flak vest is a form of body armor designed to provide protection from case fragments ("frag") from high explosive weaponry, such as anti-aircraft artillery ("flak" a German contraction for "Fliegerabwehrkanone" ("aircraft-defense gun")), grenades, some round shot used in shotguns and land mines and other lower-velocity projectiles. It is not designed to protect against bullets fired from small arms such as rifles or handguns. However, certain flak jackets are able to sustain certain gunshots, depending on the armor, the projectile, and the range from which the shot was fired.