Thank you for viewing. These are stud earrings purchased on Amazon. They are new and unused. -- These are low-allergy, surgical stainless steel screw-back earrings, with 2mm, 3mm, and 4mm ball sizes and waterproof functionality. - Brand: Stjarna - Sizes: 2mm, 3mm, 4mm - Material: Surgical Stainless Steel - Allergy Information: Low-allergy -- 【Sizes】The diameter of the ball is 2mm, 3mm, and 4mm respectively. The straight bar diameter is 0.8mm (20G), the length is 6mm, and the earring back size is 5mm. There are 3 pairs. 【Ball Stud Earrings】These simple yet stylish earrings create a fashionable look. Their understated presence makes them easy to match with any style, and they are suitable for a wide range of occasions, from casual to formal. They are also perfect as first or second earrings. They are a popular stud earring type, along with hoop earrings and ring earrings. 【Material】316L stainless steel. Durable, resistant to sweat and moisture, rust-resistant, tarnish-resistant, wear-resistant, and deformation-resistant, making them easy to maintain. They are comfortable to wear, have a low risk of allergies, and are suitable for sensitive skin.