This Premium Microfiber Lens Cloth from Sensei is an all-cotton, nonabrasive microfiber cloth designed for cleaning glass optics without smudging or streaking, especially when removing stubborn oily marks like fingerprints. The 11 ÿ 15" size is suitable for large optics like telescopes and telephoto lenses. It may also be used to clean tablets, television displays, and monitor screens. This premium cloth can be washed with soap and water, or machine-washed with laundry when fabric softener is not being used