Bak-4 prisms for bright, clear, crisp viewing. Fully multi-coated optics for superior light transmition and brightness. Textured center focus knob for easy, precise adjustments. Rugged, non-slip rubber armor absorbs shock. Waterproof, fog proof. Magnification x objective lens: 10 x 42.Size is 10x42. Dimensions are 8.9 X 6.9 X 3.8 UPC Code = 029757221049