The SilverGEO® x10 field lens is superb quality and has excellent optics, yet offers great value for money. This lens has a x10 lens with a large 21mm viewing. It comes in a neat jewellers loupe display case measuring 5cm x 3.5cm x 2.5cm. Each loupe also has a metal loop and is supplied with a metal lanyard. Please note the metal clip on the lanyard means the lens may not fully close, however in trials we have seen that this makes it virutally impossible for the lens to fall off. You can however insert a nylon or thinner wire loop between the lanyard and lens.