These earring parts are made of surgical stainless steel, which is gentle on the skin. They are made of the same material as scalpels and scissors used in surgery. The stainless steel used is high-quality SUS316L. We highly recommend these for those who suffer from metal allergies. They are reputed to not cause itching even in the summer. You can confidently recommend them to others, so why not use them in your own creations, professionals? In my shop, even those who experience allergic reactions to gold and titanium are using them. They are easy-to-use, simple shapes. Length: 18mm Wire thickness: 0.7mm This is the price for 20 pairs. We also have 10 pairs and 50 pairs available. No comments needed, instant purchase OK.