... ,Al2O3 1.DescriptionAlumina PE Compound Chest-protected Bulletproof Ceramic Plate, suitable for military training or bulletproof vest ... inserting. MaterialSizeBulletproof area:Bulletproof levelThicknessWeightPE, ceramic plate250mm*300mm 750 square centimeterNIJ III 18mm2.0Kg Resist ... take advantage of the high rigidity of alumina ceramic plates which are compound with highly rigid PE ...