Chemistrie 30 Magnetic Clip On Lens For Eyeglass w/Magnetic Case, POLARIZED Gray Excellent condition ***New/preowned, but never used*** Discrete neodymium magnets drilled directly into the primary prescription lenses Lenses lock together directly using magnets rather than heavy metal backing mechanisms Eliminates added weight and prevents scratches on your daily eyeglasses See photos for details and measurements. Message for questions