Hi there. That’s a fur called kolinsky which is Siberian weasel and is related to mink. It’s known for being soft and sometimes they use the fur for the bristles of make up brushes.
Thank you Linda. No storing in the freezer. If the skins freeze they can become brittle and crack and moisture can rot the skins as well. When cold stored the temperature is cool, somewhere around 45 degrees, but there is no ice and no moisture.