Ferrites are ceramic components that can be used to suppress electromagnetic interference (EMI) in certain applications. This paper will discuss the basic properties of solid round ferrite cores, the impact an air-gap can have on the performance of these cores, and special considerations. In particular, this paper focuses on the use of 75-material in low-frequency suppression applications since its permeability is relatively high compared to other soft ferrites used for this purpose, making the effect of an air-gap much greater...