Metal: 5 Pairs stud earrings for men made of brass with 18k black gold plated with rhodium finished. Nickle free and lead free, Hypoallergenic and don't irritate the ears. Gemstone: 3/4/5/6/7mm stud earrings with round black crystal stone. Various sizes studs earrings to match your different need. Gauge Size: 20G earrings set perfect for someone like petite jewelry, especial who has multiple piercing on each ear, so wore them in graduating size, they would be really cool set if you have multiple studs in your ears. Earring backs: The men stud earrings with butterfly backs, safety and keep comfortable for daily wear. Packing: 5 Pairs black crystal stud earrings pack come with a jewelry pouch for birthday gift/ valentine's day/mother's day/father's day for father, boyfriend, mother, wife ,husband, best friends, daughter, grandma, etc.