COS (TM) Triple Pendant DNA Neurotransmitter Necklace - Dopamine Acetylcholine Serotonin 18 Inch Matching Silver Toned Chain 3 Pendants - 1 Necklace Unique Design Perfect for Chemistry Students or Professors Assembled Personally by Myself (supplies may be limited as a result) Double Checked for Broken Links and Malfunctioning Clasps