Our cast Caffeine molecule necklace offers you the chance to show your love for the world's favorite drug. The molecule itself is approximately 1.5 inches in width. The necklace is 17 inches in length and it is sterling silver.The molecule is made from sterling silver. We understand that this is a unique product and it deserves a museum quality packaging. Our unique packaging adds to the presentation and the value of this necklace as it comes in a beautiful glass topped box that has an anti-tarnish tab and the air tight closure helps to prevent tarnishing due to airborne corrosive agents such as smog. Additionally, it comes packaged with an informational card to add to its unique presentation. Anatomology guarantees that ABSOLUTELY EVERY COMPONENT of this necklace is 100% sterling silver, including the molecule, the chain, all jump rings and clasp. We can provide testing results if you have any questions. Anatomology is a company that was developed by a psychology professor who wanted to make interesting psychology related products that were beautiful and elegant rather than geeky. We make everything in our studio in Los Angeles. We are committed to quality and manufacturing high quality products. You will find us very easy to work with and a trust worthy organization.