Glass wheel chain statement necklace is made of individually formed glass circles. Each glass circle wheel is made by carefully shaping a thin glass rods in a 2,000 degree flame. The glass is formed into a circle using heat and gravity and then the raised dots are added around the outside. Matching earrings available. Made with Borosilicate (Pyrex) Glass, Life Time Warranty. Lobster clasp and jump rings are sterling silver. Length including clasp approx. 20", 2" wide. Each piece comes with info card about the artist and how the piece is made.