With 8x magnification these folding binoculars are compact and light weight so you take them with you everywhere. Features include a convenient centrefocus knob for easy focusing and multicoated lenses for maximum brightness and contrast. 25 Year Guarantee. Centre focussing to allow you to quickly and easily adjust to different focal ranges. Roof prism. Lens diameter of 21mm. Magnification 8x. 9.84. Rubber body. Twist up rubber eye cups. Weight 215g. Manufacturer's 25 year guarantee.