These side armor plates are made from alumina ceramic material and they come with level III rating.
These hard armor plates usually inserted into the side pockets of a level IIIA bulletproof vest. These plates offer level III protection which can withstand pistol and rifle rounds as M16 and AK47.
A full body armor is often too expensive and will slow down a soldier by reducing their mobility and maneuverability. Side plates on the other hand, in conjunction with front and back plates, helps to provide a balance between protection for vital organs and ease of movement.
These armor plates which are classified as hard armor are measured 8x8inch in size. This ceramic plate has been hardened with alumina or aluminum oxide to ensure that that you are protected adequately.
Even though they are extremely hard materials, you should exercise caution while handling the plates so as not to disrupt the structural integrity of the plates.