1. NIJ certified, level III&IV; 2. Al2O3 level III< 2.1kg, level IV< 2.5kg; 3. SiC plate level III <1.8kg ... , level IV< 2.2kg Body Armor PlateDescription:This type of ceramic series, ... material AL2O33.Shape:Type T, Type E ICW & Stand Alone Style Body Armor Chest Plate