The Vintage Crystar Lens 2.5x Sports Glasses Pocket Size Binoculars are compact opera glasses with a blue color and a maximum magnification of 2.5x. Made in Japan, these folding opera glasses are lightweight and ideal for opera glasses applications. With a 25mm objective lens diameter, these pocket-size binoculars offer a convenient and stylish way to enjoy opera performances or sports events. The brand Crystar is known for producing quality optics, making these glasses a reliable choice for any opera enthusiast or sports spectator.