Mammoth Ivory Disc BangleEach beveled disc shaped bangle is hand carved from one solid grade A piece of prehistoric woolly mammoth tusk. An eco conscious bracelet perfect worn alone or stacked with gold or gemstone jewelry. Each bangle is approximately 10mm thick. This style of bangle has an interior diameter of approximately 2. 5. The best way to get a good fit is to measure an existing bangle you have that fits you well on the interior of the bangle from side to side.