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In my list the "Effective" is how much of the grit is on the surface of the strop..

ie: Felt allows the grit to sit "lower" into the surface then Balsa, so it gives a more gentle cutting action

You are comparing effectiveness.

The base for the Sprays or Pastes is partially determined by what you put it on

Basically it runs from most effective to most gentle

Balsa
Linen/Webbing...