Turn your favorite safety glasses or sunglasses into reading glasses. No more squinting to read, stacking safety glasses over your reading glasses or wearing two pairs of glasses around your neck. Optx-20/20 Stick-on HydroTac lenses are soft, pliable, lightweight, precision- optical lenses that easily apply to any style safety glasses or sunglasses with water. Size: 1.2" diameter one pair per package. Stick-Ons may be trimmed if necessary. Can be removed and reused over and over.