Selection of ferrite material

Hi All,
I want to select a ferrite material for my drum core.
While going through the material specs, I didn't understand these three terms;

1) Saturated Magnetic Flux Density Bs (mT)

2) Remanenz Flux Density Br (mT)

3) Relative Loss Factor tanδ/μ (100 kHz)

Can you guys please help me to clear these terms in a simple way?

Also, for these specifications please suggest is, for an application, requirement is "High" or "Low".

Thanks!

Hi!
Can any one help me for understanding these specifications?

Thanks!

A hysteresis curve makes it easy to understand:

https://slideplayer.com/6877632/23/images/37/Hysterisis+The+entire+curve+(shaded)+is+called+the+hysteresis+curve..jpg

Something that it is not explicitly shown in this image is μ, which is the magnetic permeability, and is defined as the slope of ΔB/ΔH.
It changes as the B increases, and is usually quoted as the slope of the blue curve close to the origin.