This is the RX Lenses for Promate Brigadier Scuba Diving Mask Scuba Diving Prescription Mask Lens - Optical Lens ONLY Features: Optical Lens for MK207 Please note there will be an additional 2 to 3 days processing time for most RX lenses Cost is per single lens only Nearsighted -1.5 to -7.5 by increments of 0.5 Interchangeable lenses Optical Lens for MK207 - Piece (nearsighted -1.5 to -7.5 by increments of 0.5) Returns are not accepted for used lens. Only unused lens are eligible for return with store credit.