This Mule Head pin is a perfect gift for Farmers and Horse Owners. Each pin is double tacked (military style) to avoid spinning. We only use strong neodymium magnets for a powerful grip. Proudly crafted by American Artists. After casting, each piece is hand finished and polished for a beautiful antique look. Satisfaction Guarantee! The mule is a hybrid of a horse and donkey making them infertile or sterile. They are patient, hardy and long-lived animals making the prefixed domesticated pack animal. The size and shape of the mule depend a lot on the horse and donkey parents.