LONGWIN Crystal Dome Paperweight Reading Magnifying Glass-2.4 Inch Material: k9 crystal Diameter:60mm(2.4"), height:28mm(1.1") Glides effortlessly across any surface Perfect for reading newspapers, maps, contracts, architecture plans, negatives, documents, and other reading material! A dome magnifier, also known as a hemispherical magnifier or bright field magnifier, is a light gathering magnifier that is uniquely shaped in a half circle. They are constructed from pressure formed and polished solid acrylic.