Pentax Whitetails Unlimited 10x50 Binoculars Durable, Polycarbonate Construction Withstands Rough Handling Rubber-covered Exterior Provides A Sure Grip & Protects Internal Mechanisms Wide Field Of View With Long Eye Relief Rubber covered exterior provides a sure grip and protects the internal mechanisms Durable, polycarbonate construction withstands rough handling BaK4 prisms allow more light to be transmitted for easier viewing in any condition Comfortable rubber eyecups adjust for use with or without glasses Worry Free Warranty