Frankford Arsenal, Media Release Magnet WARNING: Cancer - www.p65warnings.ca.gov. Gathers then Releases When Handle is Pulled Easily Transfers Stainless Media Pins The Frankford Arsenal Media Transfer Magnet is ideal for handling the 304 stainless steel media pins that come with the Platinum Series Rotary Tumbler. This magnet effectively gathers and then releases pins with a pull of the handle. The Media Transfer Magnet makes separating pins from brass fast and convenient.