Material: PE with Ceramic NIJ Threat LevelMeasure (cm)Unit Weight (kg)IV, stand alone.30x25x22.8IV, in conjunction with IIIA armor vest. 30x25x1.72.5III, stand alone.30x25x1.72.3III, in conjunction with IIA armor vest.30x25x1.52.1III, in conjunction with IIIA armor vest.30x25x1.52 bullet proof plate