On the other hand, at least two instruments or instrument families are like those in other orchestras. According to the Vienna Philharmonic's website, "the flute is largely the same as the conventional Böhm flute, which is widely used all over the world. However, it did not replace the wooden flute in Vienna until the 1920s." Also, the Viennese string sound should not be attributed to unique attributes of the instruments, according to the VPO, which writes on its website, "There can be no doubt that the Viennese string instruments themselves, unlike the winds, are not of prime importance in producing the orchestra's unique sound. With a few exceptions, the quality of the instruments of the string section is not particularly outstanding.". To be sure, the instruments are of high quality; Austria's central bank Oesterreichische Nationalbank currently loans four violins made by Antonio Stradivari to the VPO.