This is the RX Lenses for the Genesis SL RX Scuba Diving Mask Features: Prescription mask available - item code MSK115 Please note there will be an additional 2 to 3 days processing time for most RX lenses Cost is per single lens only Optical Lens for SM4400 Nearsighted -1.0 to -8.0 by increments of 0.5 Optical Lens for SM4400 - Piece (nearsighted -1.0 to -8.0 by increments of 0.5) RX Lenses for the Genesis SL RX Mask Scuba Diving Prescription Mask Lens - Optical Lens Returns are not accepted for used lens. Only unused lens are eligible for return with store credit.