New Prescription -3.5 Hele i Waho Snorkeling Mask Yellow Green My father purchased this several years ago, but the prescription changed and it has been stored unused. An oil film was attached to the inside of the lenses when purchased, so I polished it with an anti-fog solution before listing it. However, it is new and unused. Please polish it again before use. There is no deterioration of the rubber. Please consider it if the prescription is suitable. I am not familiar with diving, so I cannot answer questions. I have taken pictures of the instruction manual, so please refer to it. Due to the high shipping cost, I cannot accept significant price reductions, so please understand. The case has scratches from storage.