Please read the profile before purchasing m(_ _)m K18 Post Earrings - Single Earring (Set of 3) All 3 have a K18 stamp on the post. (Not a coating.) ⚠️ The balls are not K18, but ✴️ They are allergy-friendly (nickel-free material). ※ Silicone W-lock catch The simple design is versatile and can be used as a main or sub earring, and can be easily paired with other earrings! Balls... 4, 3, and 2 mm, 1 each ▪ Illustration model's ear length: 6.3-6.5cm Made in Japan for peace of mind. ※ PT900.K18 post earrings Nickel-free post earrings Also available.