Manufacturer's part #02 MFG 000. Original price for the set of 4: $144.00. Polished but not aluminized 12.5mm Square Mirror. Material: LEBG. 6mm thick. Not aluminized. Polished on one side, ground but not polished on the other side. Could be aluminized to make a high reflection mirror or used as a mirror in applications where only a small amount of reflection is wanted such as sun reflection or certain laser applications. You will receive (4) in the case for our low price! Unused