Here is the perfect kit for mounting convex lenses (glass or plastic) to your Monster M4sk! These acrylics has been laser-cut specifically for lenses with a lip-edge, so we can't guarantee it'll fit with any ol' convex lens. But it does work great with ours. And of course, the mounting hardware is included, so you can snap it right onto your M4SK. Takes less than five minutes to assemble, you just need a screwdriver.