This is a 2-piece set of mask and snorkel from Reef Tourer. It comes with detachable prescription lenses for myopia. If you remove the prescription lenses, it becomes a non-prescription mask. The prescription is -5.0. It has only been used 2-3 times, so I believe the condition is good. It originally cost around 3500 yen. There is no case, so it will be shipped wrapped in bubble wrap. Thank you.