1X TDK Φ9mm AV Data Cable RFI/EMI Filtering Magnetic Ring Shield ZCAT2035-0930A | eBay
High Sensitivity Sensing of Weak Biomagnetic Fields at Room Temperature - For the First Time in the World, Also Successful in Visualizing the Magnetic Field Distribution of the Heart | TDK Developing
Ferrite magnet - TDK Electronics Europe - segment shaped
Tdk Magnetic Interference Filter Core Magnetic Ring Can Snap Button With 7-8mm Wire - Connectors - AliExpress