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Revant Replacement Lenses for Costa Mayfly Lens Color:Gray Green Photochromic And because our lenses meetMake your old Costa Mayfly lenses like new with our replacement lenses for Costa sunglasses. These lenses perfectly fit Costa Mayfly with the model number 6S9110. And because our lenses meet or exceed the quality of your original Costa Mayfly lenses, you'll get the same performance you've come to expect.