Polka Dot Tunnels 22K Gold PlatedContemporary and bold, geometric tunnels with a wide front flare. These tunnels are made from Sterling Silver 925 with 22K Gold Plating. There is a clear, hypoallergenic ceramic coating over the gold plating to protect it and extend its life. Sizes range from 2 g (6 mm) to 1 inch. Polka dots rule! The wearable height is 9 mm and the front flare is a continuous curve to the back with a back flare adding just 0. 5 mm to the total width of the design.