This Pendant is Made of Resin + Bone Powder. Bone has been carved into jewelry for a very long time as it represents the strength of wild animals. This pendant comes on an cotton string. Cotton is durable and you can wear it while swimming or taking showers. The shark teeth design represents the bonding of family, symbolizes good luck, good health and long life. It is considered a good luck charm by travelers, boaters, fishermen and surfers.