Unlike other cloths, the optical cleaning wipes from Selens pass a series of qualification testing. It can actually remove the grease and dirt with no residue... rather than merely pushing it around. Also, the special properties of the wipes have also been enhanced during the final stages of production. It contains no alcohol and ammonia, making it a safe cloth suitable for multiple uses. Item features: To kill bacteria effectively and prevent of germs propagation Non-alcohol and ammonia ingredient, perfect for cleaning almost any optical glasses, screen, lens Antistatic & antimist formula Environmental-friendly and non-toxic Easy of use, saving of effort and time Ideal for carrying in your purse, briefcase or car