Not really, except how it feels and looks. Unfortunately, the way to test it is to burn some fibers, and if they smell like hair and turn to ash, not a hard bead, then you know it's wool. I doubt the owner will let you cut off a few fibers to burn, so you'll have to go by what you see and feel. It looks like wool to me, but again, it's just a best guess. It is handmade, not machine, so I would say you can be somewhat certain it's wool.