The larger DiveOptx® Stick-on lens turns any dive goggles or masks into powerful bifocal magnifying glasses with unmatched clarity. Check your air gauge or see your watch clearly underwater. It’s amazing what these wonderful stick-on lenses will allow you to see. Just add water and adhere to the inside of your diving mask. The larger 38mm 1.6 inches diameter gives you an even bigger view of the deep. DiveOptx® lenses are removable and reusable for long-lasting value. They can be trimmed to size with a sharp scissors and positioned anywhere on the lens. Take DiveOptx® Stick-On lenses on your next dive trip for a whole new experience. Designed for use with all diving masks LARGE 38mm /1.6 inch diameter for increased field of vision Material: Polymer aspheric Removable and reusable Unisex Price per Pair To fit the glass on mask and lens must be very clean. Use methalated spirit (On Glass Only) and buff dry. With water in mask position lens then empty. Press on Optex lens to expell water and leave to completly dry. Lenses can be peeled of to reposition.