These Eikow/Japan Coated Lens Binoculars are a great addition to any collection. With a compact size and blue color, they are perfect for opera glasses, marine activities, bird watching, and general purpose use. The binoculars have a 25mm objective lens diameter and a maximum magnification of 25x. In addition, the binoculars feature a zoom lens and anti-reflection coating. They are made in Japan and have an unknown optical design. The California Prop 65 Warning does not apply to these binoculars. Whether you're an astronomer or just enjoy the view, these binoculars are a must-have.