Check the listing for details. 5Pcs Ferrite Filter Ring Core RFI EMI Cable Clip ID 13mm Black. Condition: New. Listed at 25.31 USD. What is this?Clip-on Ferrite Ring Core is a toroidal core made of ferrite material with a clip-on design that allows it to be clipped directly onto cables or wires. Anti-interference magnetic rings are components used for electromagnetic interference (EMI) suppression. Toroidal cores are commonly used in network devices such as routers and switches, and electronic devices such as car audio and navigation systems.What will I get?Inner Diameter: 13mm / 0.51 inchOuter Diameter: 30mm / 1.2 inchLength: 32mm / 1.3 inchColor: BlackIn the package of: 5 x Clip-on Ferrite Ring CoreAre there any advantages of the product?1. Easy to install, the clip-on design allows the Clip-on Ferrite Ring Core to be easily clipped onto cables or wires without the need for additional fixtures or tools;2.