Blue stone type 18G Stone: 2mm, Post: 4mm Silver ball 20G Ball: 4mm, Post: 4mm Purchase price: Stone: 966 yen Ball: 699 yen These are medical-grade surgical stainless steel earrings, which are less likely to cause allergies. I bought the short ones for cartilage piercings, but I have thick fingers and find them difficult to put on, so I'm selling them. They are not unused, but they have been boiled and sterilized with alcohol for sale. Please refrain from purchasing if you are concerned.