Oxytocin is a molecule that has gotten a lot of research attention. It has been found to be involved in trust, bonding, orgasm,male and female sexual behaviors and touch. This is a key chain of the molecular structure of oxytocin. As with most all of our products, we like to make things easy for you, so it comes with a card and is all gift boxed and tied with a black satin ribbon, so that all you have to do is write your beautiful words of endearment on the card and walla... you are set to go.... The molecule is approximately 2.5 inches in height and is cast in a base metal (zinc alloy). It hangs from a standard steel key ring. A unique, interesting gift for that special someone who knows all about oxytocin.