Five pounds of trash recovered from the world's oceans, rivers, and coastlines for every necklace sold Hypoallergenic .925 sterling silver necklace with extender that adjusts from 16" to 20" in length Wave-shaped pendant approx. 15mm in diameter (a bit smaller than a dime) All opihi shells from Dunes Sandbank were ethically harvested by a native Hawaiian who shared a single meals worth of shells with Dune after serving this delicacy to her family from her home on Oahu Blue 4ocean Plastic is certified 100% ocean plastic that our captains and crews recovered from the shores of Oahu Handmade with love and sandy hands in Dunes Boston, MA, studio Ships directly from Dune