UNAPHYO Men's Stainless Steel Retro Round Amulet Pendant with Taiji Eight Diagrams Yin Yang Necklace Ying and Yang Tai Chi Pendant Necklace Pendant Size: 30mm, Weight: 13.5g. Chain Length: 500mm(20 inches). Material: Crafted from genuine stainless steel. 100% Hypoallergenic. Waterproof. Fade Resistant. No Deformation. Promise 90-day Products Exchange or Money Back Guarantee. With a velvet pouch for package. If you have any question, please post it in the part of "Customer Questions & Answers" below the page, you will get the answer by us or buyers quickly.