Antique reproduction stainless steel head cage. Hinged at side and opens with allen wrench type key. Inside is lined with rubber material. 1" rings are attached at top and at front and back of neck. Available in small and large. Small weighs 4 lbs 15 oz and is 12" high and 9 1/2" back to nosepiece; inside perimeter of neck opening is 17". Large weighs 6 lbs 4 oz and is 13" high and 12" back to nosepeice; inside perimeter of neck opening is 18 1/2". One allen wrench type hex key included.