Fitting to Signature tone arms and turntables, the Pro-Ject company developed 3 different headshells. In general every material has its own sound character. Additionally it allows you to have a cartridge collection with different types of phono cartridges. So you can select your favorite for different type of music or records to maximise your sound quality. The different mass of the Headshells gives also the possibility to get the correct weight of your cartridge/headshell combination, which fits perfect to your arm! You can use the mounting screws of your cartridge, but if you want a set of anti-magnetic screws to be able to install a multitude of different cartridge types on your Signature Headshell, Pro-Jects Mount it is your perfect choice.