The nikon action ex 8x40 binoculars are suitable for birdwatching hunting mountaineering marine sports and spectacle wearers a truly extreme and rugged binocular the action ex is built on an all metal chassis with all optical components installed in a lightweight polycarbonate shell the ex is nitrogen filled and o ring sealed for total waterproof and fogproof performance in any environment the rubber shock resistance exterior provides a firm and comfortable grip