These hook earrings feature atomic symbol motifs of serotonin, a neurotransmitter deeply involved in mental stability and often called the "happiness hormone," and dopamine, a brain hormone responsible for creating pleasure and motivation, also known as the "motivation hormone." The motifs are different atomic symbols, one for each earring. ◆ If you would like to change to earrings, resin hook earrings, or titanium hook earrings, we will change them for free if you add a message like "Change to earrings" or "Change to resin hook earrings" in the transaction message after purchase. (You do not need to inquire in the comment section before purchasing, such as "Can I change to earrings?" You can order directly.) ※ Changes to hoop earrings, resin non-hole earrings, titanium post earrings, or resin post earrings are available for an additional 100 yen. Please inquire in the comments if you wish to do so. 【Size】Serotonin: Approximately 24 x 16mm (excluding hook) / Dopamine: Approximately 25 x 12mm (excluding hook) 【Notes】 ※ Immediate purchase OK. (No need for comments like "Can I buy it?" Please purchase directly.) ※ No price reduction. (However, if you purchase multiple items, we will discount 100 yen for each additional item. If you want to buy two or more items, please comment before purchasing.) ※ We will ship within 3 days after confirming payment. (We make the items after receiving your order and payment, so we cannot accept requests to expedite shipping, such as "I need it urgently.") ※ Please make sure to check the "size" and "materials" of the work before purchasing. ※ The color may look different on the screen than in reality. If you have any questions, please contact us. ※ Please be careful as dropping or applying excessive force may cause damage. ※ Please note that we cannot accept exchanges, cancellations, or returns due to customer circumstances (such as "it's different from the image") after the order is completed. #men #unisex #molecule #resin earrings #titanium earrings #for both ears #serotonin #dopamine #structural formula #earrings #science #buyee