Medium Sized Brass Demonstrational Armillary Sphere This armillary sphere is solid brass with a rich antique patina finish that will not tarnish or show fingerprints. The rims of the armillary spheres are marked "A PARIS Chez G. Gobille a P Ache Royalle." The heavy solid brass base is mounted on turned solid hardwood, and the bottom is covered with felt. The Medium Sized Brass Demonstrational Armillary Sphere measures 8 1/2 inches tall, 5 1/3 inches in diameter, and weighs 1.7 pounds (0.7 kg).