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A collection of seven representative jets from Asturias (Spain) was studied. Some artisans of the Asturian jet industry established the quality criteria of the jet based on the user-friendly properties of this material. In this work, we study the relationship between the working quality of asturian jets and their structure using parameters defined by liquid 1H-NMR. With this aim, certain parameters calculated from the NMR results were used to provide information about the structure of compounds extracted from jets. [ABSTRACT FROM AUTHOR]