Human Kidney Necklace (Anatomical Kidney) is made to order with your choice of necklace types, including: a 14" or 18" silver stainless steel cable chain or silver stainless steel ball chain. Other necklace types available are black, denim blue, gold and natural tan 100% genuine leather all in 14" or 18." We also offer a vegan black waxed cotton cord in 14" or 18.". All necklace types have a lobster clasp closure. Optionally, add a birthstone charm and/or a silver initial to make it personalized. Made with quality material and craftsmanship, it is a truly unique gift for you or someone you love. If you need a custom order not offered, please contact us.