These binoculars are rubber covered aluminium with ergonomic thumb indents/finger ridges which provide a comfortable, non-slip grip.Also included in this kit is a naturalist's guide to the birds of Britain and Northern Europe book to help identify the observations you make.7x magnification: Will bring objects 7x closer. This is an ideal magnification for bird watching.35mm objective lenses: Powerful light gathering ability will reveal details, even in the shadows.Porro prism: A traditional design that can offer a more three- dimensional image effect compared to roof prism designs. K9 prism: K9 glass gives good colour and contrastCoated lenses (C): Coatings improve colour, contrast, and brightness. For (C), at least one glass surface is coated with one coating, and could be considered as “entry” specification for coatings161m field of view: This is the actual width of the image you will see at 1000 meters away from youWater resistant: Enjoy your binoculars in the great outdoors, not suitable for extremely wet conditionsDiopter adjustment: To adjust for slightly different vision in each eye to achieve crisp focus personalised to your eyesightMulti-Use: Suitable for nature, birdwatching, sport, travel. 4m close focus: This is the minimum distance you must be from an object to achieve focus. This is great for closer subjects such as flowers and insects.