These Terra Ed binoculars by Zeiss are the perfect general-purpose binoculars for your next adventure. Featuring an objective lens diameter of 42mm, the binoculars provide a maximum magnification of 10x. The lenses are fully multi-coated and feature roof-prism optical design. The binoculars are fog-proof and waterproof, making them highly-durable and perfect for use in any conditions. Their black, full-size design is suited for use by adults.