＝Made in Japan＝ Allergy-friendly earring backings. These metal backings are cadmium-free, nickel-free, and lead-free. ⭐ 1 bag (10 pieces) Material: Brass Colors: Gold, Silver, Pink Gold Size: Width approx. 4.2mm, Length 3mm, Thickness 3mm, Hole: approx. 0.8mm (compatible with 20G) Perfectly fits your existing stud earrings. These are finished to be gentle on the skin, containing almost no nickel, which is a major cause of metal allergies. You can wear them with peace of mind even if you have metal allergies. ※ Individual reactions to metal allergies vary. This does not guarantee that all people will not have an allergic reaction (allergy-free).