The group of historical, immaterial, technical, and artistic values wich the blow glass technique represents, as well the process, knowledge, products, tools and associated machines, make it worthy of this official recognition as "Representative demonstration of cultural immaterial heritage of Spain".

According to this cultural values, this award underlines the survival, through the centuries, of two important production centers: The Royal Glass Factory in La Granja, Segovia, and Gordiola Glass, in Mallorca.