This piece was inspired by the molecular structure of serotonin, an important neurotransmitter that is sometimes known as "the happy chemical" since it appears to play an important role in regulating mood. Information: - made of solid stainless steel, which is hypoallergenic for most people - gold and rose gold pieces are vacuum plated over top of stainless steel - pendant measures 12mm x 25mm - chain is adjustable between 17"-19" Packaging: - all items come with an information card in a lovely recyclable box, ready for gifting