A Stradivarius is one of the violins, violas, cellos and other string instruments built by members of the Italian family Stradivari (Stradivarius), particularly Antonio Stradivari, during the 17th and 18th centuries. According to their reputation, the quality of their sound has defied attempts to explain or equal it, though this belief is disputed. The name "Stradivarius" has become a superlative often associated with excellence; to be called "the Stradivari" of any field is to be deemed the finest there is. The fame of Stradivarius instruments is widespread, appearing in numerous works of fiction.