Add science to your tux. If you want to make someone happy, why not go straight to the source? These serotonin cufflinks are modeled off the molecules that interact with the brain to create feelings of happiness, satisfaction and relaxation. Elegant yet original, these sterling silver cufflinks are handmade in California by Dr. Raven Hanna, a Yale-educated scientist turned artist. Each piece is sterling silver and comes in a recycled box with an informational tag. Handmade in California.