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Yes, Flax linen.

Those are some great looking strops.

There are some strop makers who are using Hemp/linen strops as secondary material. And several using polyester and nylon.

No one I know, that makes a new real linen or separate nylon or Polyester...

Look at your razor with magnification, the day after you have shaved with it. No matter how well you have rinsed and wiped the blade, you will find bits of soap, skin, blood and rust on the bevel and...