Hinged together with an antique bronze jump ring. One tin is a vintage German tin and the other is a beautiful vintage red and offwhite tin - origins unknown. Earrings are handcut and sanded. 
Earring wires are antique gold-plated brass, 16mm flat fishhook with open loop, 21 gauge.  Each pair come with silicone clear earring backs. 
Earrings have been treated with a museum grade wax to protect and enhance, called Renaissance.
Some Tins are Vintage and worn and add a Unique element to the Design.