Whitetails Unlimited 10x50 binoculars have a rubber covered exterior provides a sure grip and protects the internal mechanisms, wide field of fiew with long eye relief, and comfortable rubber eyecups that adjusts for use with or without glasses. A durable, polycarbonate construction withstands rough handling. Center focus offers fast and easy handling. Multi-coating eliminates harmful ultaviolet rays and also improves light. BaK4 prisms allow more light to be transmitted for easier viewing in any condition. Pentax has the Worry Free Warranty.