Just got my new modular strop in from Srp today and had a quick question. It came with a smooth leather, a rougher leather and two grey things that I would liken closer to linen (but it's not) I forget what it actually is, and some .05 diamond spray.

So my question is... Which one do I start the diamond spray on? I have a nice hanging strop that I put the white ti paste on the linen side and I kinda regret doing that since it's more abrasive than what I think should be on it so I don't want to make the same mistake with my new toy.
Other than that this thing is gorgeous and just plain awesome. I'm astonished at SRP's quality, ingenuity, and speed on getting me this bad boy.