The Lifegard Aquatics Clear Glass Bookshelf Aquariums are manufactured with a high-quality German glue that makes the glue joint invisible. These rimless aquariums are made of Ultra Clear glass which allows the viewer an undisturbed viewing of their underwater masterpiece. The extraordinary craftsmanship with precision cut edge bonded with high-quality Clear Silicone glue makes it an exceptionally clear aquarium with none to match in the market. There are three sizes to choose from.