The Raiatea Binoculars by West Marine feature a designation of 7X50.  The features are: *best low light viewing, *minimized field curvature/distortion, * BaK-4/Porro prisms for more light transmission, *Convenient center focus, *Comfortable 27.4 mm eye relief, *Rubber armored for durability, * Padded nylon case/Padded neck strap, *  LIfetime limited warranty  Model 2677680.