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I bought one of these leather straps and a linen cloth from ebay.

Here is the sellers I found and can be useful for others:
Linen:
Toners Blenders, Riley Blake items in Totally Patched store on...

I was searching and see that there are many people making their own strops.

I searched on Internet and found some leather straps, but I'm not sure if they can be used for strops, or if they need...