Our Nano Coat One Way Mirror Sponge contain PET. It can better resist the strongest shocks than ordinary mirrors, significantly reducing the risk of breakage or damage. Its use method is very simple: clean the dust or debris on the surface of the glass, open the lid, wipe the sponge on the surface of the glass, gently wipe, wait 5-10 minutes and then wipe it clean with a dry cloth. After use, from the outside of the glass, the indoor situation cannot be clearly seen, resulting in a one-way glass effect.