Handmade glass has a number of manufacturing features which make each piece unique. Each item is not part of a series, but has been handmade by a master craftsman, using a historical mould and the same techniques employed by his predecessors in the Real Fábrica de Cristales de La Granja. The finished articles are individually produced and may contain certain irregularities due to the manual nature of the work. These should not be considered defects in any manner, but as unique and integral parts of the object.