5mm Flat Leather Whiskey Brown Dyed Hair on Leather. Hair-on leather, also called pony hair or haircalf leather, is just like our regular leather except the cow hair has not been removed and the pelt is then dyed. This is a top quality cowhide leather with the hair left on the hide. Use this flat leather to make easy and unique bracelets! Cut leather cannot be returned. Sold by the inch.