stainless steel 16g 6mm black 365 sleepers 365 sleepers are made of the highest quality non-irritant 316l surgical stainless steel. the fabulous design of 365 sleepers means they are suitable for men, women and children to wear 24 hours a day,7 days a week, 365 days of the year! 365 sleepers can be worn as earrings and body piercings as well - lips, nose, eyebrow etc.