The ZCAT13D with Ferrite Clamp On Cores 34mm x 20mm x 13mm, -40 to +85 degrees Celsius, 40O(10MHz to 100MHz) is a ferrite core manufactured by TDK. It is used for RF, DC and AC applications which require a clamp-on core. It has operating temperature range of -40 to +85 degrees Celsius and an inductance range of 40 Ohms from 10 MHz to 100 MHz. This ferrite core is RoHS-compliant and has customizable designs available.