Artistic Antique Bellows Stones with leather sides

I got this Bellows off Etsy about 10 years ago and it works great. We recently moved to a house with no fireplace so I’m hoping this treasure goes to someone who loves it just as much as I did I don’t know what the stones are made out of but it stokes a fire and that’s all that matters. Length 17” Width 6 1/2” at widest part