The vast majority of free standing glass towers are square, rectangular and circular shaped. Glass display showcases manufacturers are supplying a vast number of standard sizes. The most popular sizes are seventy three to seventy six inches tall by eighteen inches to twenty four inches deep or wide. Some industries like the fashion world, museums, libraries and government agencies do require custom sized glass tower cases. They may be used to display a mannequin, some large artifacts, a unique exhibit. Since they have the technology, machinery, production capacities domestic manufacturers have pretty much the exclusivity on this market. Some of the large glass towers may be made with or without glass shelves depending on their projected use. They require professional and careful handling at all stages of the production. The custom size cabinetry is a simple enough issue to resolve. The handling and assembly of extra large glass panels is more delicate and will require highly trained individuals in as well as specialized tooling. Creating and completing large custom made glass tower showcases requires the rethinking of the structural integrity of the whole item. This is due to the substantial weight of the tempered glass and to the fact that the custom tower case will have to be occasionally moved. If necessary shipping it to an outside location will also require additional and custom crating.