Small bead product is measured in ohms, is in accordance with it at some frequency impedance nominal. magnetic data parameter (DATASHEET), generally provides the frequency and impedance curve, often as standard with 100MHz, such as 600R@100MHz, meaning 100MHz impedance equivalent to 600 ohm frequency magnetic beads.

For example, a parameter of magnetic beads for 120 ω, 25%,3A,1206, refers to the frequency of 1OOMHz, the impedance is 1200, tolerances are: ± 25%, the nominal maximum current allowed through are dimensions for 3A;1206, EIAl206 (English: inches) is equivalent to JIS/IEC3216 (international system of units: mm), length 3. 2mm, width 1. 6mm. magnetic rings and beads on the absorption of high frequencies, also known as absorption filters.