The Geometric Necklaces explore color, pattern, and symmetry. They measure aprox. 3.5 inches wide and 2.5 inches long. All are made of Printed Plastic, a lightweight translucent plastic printed with a variety of whimsical colors and designs. They are on a 16" Chain with a Brass finish and lobster claw clasp. Made with Love, Treat with Care! They have been treated to make them water resistant, however they are not 100% waterproof. We do not recommend wearing these while swimming, bathing or singing in the rain!